Tuesday, 17 January 2017

Change Register - The Welsh 500m P15s - Double Subs


Change Register

The Welsh 500m P15s
Double Subs

All hills in Wales at or above 500m in height with a minimum prominence of 15m; from the 500m summit of Esgair Saeson to the 1085m summit of Yr Wyddfa


The Welsh 500m P15s is a hill list co-authored by Myrddyn Phillips and Aled Williams, and was first announced on the Mapping Mountains site on 4th November 2015 where a complete breakdown of hill totals was listed by Group.  The list then comprised of 630 hills within the main list that met the qualifying criteria with over 100 of these hills making their first known appearance in any form of hill list; emphasising the fact that this listing is the most comprehensive of its kind for this height band of hill in Wales.

The listing originated in 2004 at which time it included a sub category for those hills that met the qualifying height but only had 14m or more and below 15m of drop, these are now known as the 500m Subs.  This listing now includes two other sub categories; the 490m Subs and the Double Subs and this Change Register details those hills that are, or have been listed within the Double Subs category.

The Double Subs are those hills that fail to meet the Welsh 500m P15 qualification by less than 10m of height and also less than 1m of drop, these are the hills that are 490m or more and below 500m in height and have 14m or more and below 15m of drop.

The Double Subs first appeared as a category of hill in the November 2015 announcement of the list on Mapping Mountains, and when the totals for each category were given there were five hills listed that met the qualification for Double Subs, all of these hills were identified leading up to this announcement.

Since ‘The Welsh 500m P15s listing originated it has developed ever since with it now being co-authored with Aled Williams, having the two other sub categories within it, and having over 330 marginal hills surveyed using a basic levelling technique.  It is now also benefiting from the accurate surveys conducted with GPS / GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data.

However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded.

In recent years, acronyms or short monikers referring to specific hill lists have become increasingly popular in hill-walking circles, and during the compilation of ‘The Welsh 500m P15s’ the authors have used the Welsh word ‘Uchaf (Higher)’ to refer to these hills, with the plural being ‘Uchafion’, since these summits take in the higher tier of the Welsh uplands.  This moniker will be used on the Mapping Mountains site to refer to this class of hill.

It seems fitting that the list of ‘The Welsh 500m P15s – Double Subs should now benefit from a detailed Change Register, and although the hill list in its entirety is not yet published it is prudent for this Change Register to initially detail the changes to this sub category since the November 2015 introduction published on the Mapping Mountains site.

The Change Register to ‘The Welsh 500m P15s – Double Subs appears below with the reclassifications to the Double Subs list being detailed chronologically in receding order.



Change Register

The Welsh 500m P15s (Yr Uchafion) – Double Subs






Twynau Gwynion    496.2m at SO 06765 10699

The reclassification of this hill was announced on Mapping Mountains on 10.01.17, with the hill previously listed as a 490m Sub-Uchaf with 16m of drop based on the 498m summit spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and a 482m bwlch spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website.  This hill was reclassified from a 490m Sub-Uchaf to a Double Sub-Uchaf from LIDAR data analysed by Aled Williams, resulting in the hill having a 496.2m summit and 481.3m bwlch height, with these values giving this hill 14.9m of drop which qualifies it for Double Sub-Uchaf status.  Double Sub-Uchaf total increases by one and confirmed as 6.   
   

  
4th November 2015 – Mapping Mountains first publishes details to ‘The Welsh 500m P15s – Double Subs


Double Subs total confirmed as 5.





Myrddyn Phillips and Aled Williams (January 2017)

Monday, 16 January 2017

Mapping Mountains – Hill Reclassifications – Y Pellennig – The Remotest Hills of Wales


Pembrey Forest (SN 393 016)

There has been a deletion of a hill from the list of Y Pellennig – The Remotest Hills of Wales, due to analysis of LIDAR data by Aled Williams.  The criteria for qualification as a Pellennig is any hill in Wales whose summit is at least 2.5km from the nearest paved public road and the hill having a minimum drop of 15m.  The list of Y Pellennig – The Remotest Hills of Wales is available as a downloadable e-booklet or print-booklet version on Mapping Mountains Publications with the up-to-date master list available on the Mapping Mountains site.

The hill is situated in the west south-western part of the Mynydd Sylen group of hills and as its name suggests; it is a part of a relatively large area of land comprising almost 2,500 acres of woodland whose south-western boundary borders sand dunes with the sea beyond.  Its Cardinal Hill is Mynydd Sylen (SN 515 080) and it is placed in the Region of South Wales (C-1).  The hill and conifer plantation is named the Pembrey Forest and it is situated with the community of Pen-bre and the town of Porth Tywyn (Burry Port) to its east south-east.   

The hill can be accessed from one of the main forest tracks that emerge out of the Pembrey Country Park to its south-east, or from a public footpath to its north that forms a part of the Wales Coastal Path.

The name of the hill is Pembrey Forest and it was listed as a Pellennig with 2.560km distance between its summit and the nearest paved public road and with c 18m of drop.  The previously listed summit is positioned at SN 390 021, this position is to one of five 25m ring contours that are shown on the Ordnance Survey 1:25,000 Explorer map, and importantly this ring contour is the furthest from any paved public road.

The deletion of Pembrey Forest from the listing of Pellennig hills is due to analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data to the highest natural ground within the forest gives the hill the following details:


Pembrey Forest

Summit Height:   27.1m

Summit Grid Reference:  SN 39390 01694

Bwlch Height:  9.5m

Bwlch Grid Reference:  SN 38702 02181

Drop:  17.6m

Remoteness:  2.360km from SN 41696 02197 (does not qualify on distance) 


The bwlch position given above connects this hill to the Pembrey Forest Ski Slope, which is given a much larger 25m ring contour and also a 30m ring contour; although in all probability the summit has been altered during the building of the ski slope.  The critical bwlch for whichever high point is taken is positioned at SN 409 019 and is c 7m high.

The summit previously listed in the Y Pellennig list is to the north of the details to the hill given above, and its LIDAR data came to:


24.8m at SN 38984 02162


However, there is a higher summit in the vicinity of the old Pellennig summit and this hill’s details was also analysed with LIDAR data, these are given below:


Pembrey Forest

Summit Height:   25.7m

Summit Grid Reference:  SN 39118 02003

Bwlch Height:  13.4m

Bwlch Grid Reference:  SN 39288 01922

Drop:  12.3m (does not qualify on drop)


Aled’s analysis of LIDAR data gave the hill a 27.1m summit height at SN 39390 01694, and a 9.5m bwlch height at SN 38702 02181 (bwlch position connecting to probable artificial summit of ski slope), these values give this hill 17.6m of drop, and a 2.360km distance from the nearest paved public road which is insufficient for it to retain its Pellennig status.

This now brings the overall total for Y Pellennig to 168 hills for the Complete list (All Wales), with the total for the Mainland Wales list being 124 hills.  The Master List will be duly updated on the Mapping Mountains site.


The full details for the hill are:

Cardinal Hill:  Mynydd Sylen

Summit Height:  27.1m (LIDAR data)

Name:  Pembrey Forest

OS 1:50,000 map:  159

Summit Grid Reference:  SN 39390 01694 
   
Drop:  17.6m (LIDAR data)

Distance:  2.360km


The list of additions and deletions in the Pellennig list since the 1st edition of Y Pellennig – The Remotest Hills ills of wales of Wales was published by Europeaklist (1st edition, April 2015) is as follows:


ADDITIONS







DELETIONS


Pembrey Forest (SN 393 016)



Y Pellennig – The Remotest Hills ills of wales of Wales is now published by Mapping Mountains Publications (2nd edition, July 2016).


Myrddyn Phillips and Aled Williams (January 2017)




Sunday, 15 January 2017

Mapping Mountains – Trimble Surveys – Malvern Hills


31.12.16  Pinnacle Hill (SO 767 420)    

Pinnacle Hill (SO 767 420) taken on a clear and sunny day

The etherealness of mist is a delight, and especially so when there is a chill in the air.  Its affect is one to close off near surrounds and when coupled with the chill of a winter’s afternoon it forces gloved hands and hatted heads which emphasises the act of enclosure.

This enclosure concentrates the mind on one’s immediate surrounds; the delicate detail and seemingly distant sounds that otherwise may slip by unnoticed.  The last day of 2016 brought these conditions to the Malvern Hills as we headed south from the top of the Wyche Road, firstly on steps that gained access to a grass dewed ridge.

The sun kissed crisp winter’s day full of frost and distant views was not given us, but the enclosure of mist brought a welcome hour of contentful wandering in one’s own immediate world.

The central section of the Malvern Hills has Pinnacle Hill as its highest point, and it was the summit of this hill that we aimed for.  A few happy shadowed figures passed us, some with dogs, and others without, generally their presence was heard before being seen as mist laden voices cast out from the gloom as a foreteller.

Lou on the ascent of Pinnacle Hill

A slight breeze wisped in from the west, accentuating the dewed chill, the Trimble survey seemed periphery to the walk, but as it included a summit I thought it a shame to miss the Trimbling opportunity, and so it was placed, aligned with the highest bit of rock on the summit of Pinnacle Hill, and as Lou wandered around keeping her back functioning and her body relatively warm, I waited patiently for the five minutes of data to be stored.

Gathering data at the summit of Pinnacle Hill

Once the Trimble was packed away we retraced our steps down the northern ridge and back to the car, it had been good to get out even though we had come back without a view, sometimes one can feel better for it.

 
Survey Result:


Pinnacle Hill

Summit Height:  358.0m (converted to OSGM15) (average of two Trimble surveys)

Summit Grid Reference:  SO 76783 42065

Drop:  c 93

Dominance:  25.98%



For details on the second summit survey of Pinnacle Hill








Saturday, 14 January 2017

Change Register - The Welsh 500m P15s - 490m Subs


Change Register

The Welsh 500m P15s
490m Subs

All hills in Wales at or above 500m in height with a minimum prominence of 15m; from the 500m summit of Esgair Saeson to the 1085m summit of Yr Wyddfa


The Welsh 500m P15s is a hill list co-authored by Myrddyn Phillips and Aled Williams, and was first announced on the Mapping Mountains site on 4th November 2015 where a complete breakdown of hill totals was listed by Group.  The list then comprised of 630 hills within the main list that met the qualifying criteria with over 100 of these hills making their first known appearance in any form of hill list; emphasising the fact that this listing is the most comprehensive of its kind for this height band of hill in Wales.

The listing originated in 2004 at which time it included a sub category for those hills that met the qualifying height but only had 14m or more and below 15m of drop, these are now known as the 500m Subs.  This listing now includes two other sub categories; the 490m Subs and the Double Subs and this Change Register details those hills that are, or have been listed within the 490m Subs category.

The 490m Subs are those hills that fail to meet the Welsh 500m P15 qualification by 10m or less of height, these are the hills that are 490m or more and below 500m in height that have a minimum 15m of drop.

Since ‘The Welsh 500m P15s listing originated it has developed ever since with it now being co-authored with Aled Williams, having the two other sub categories within it, and having over 330 marginal hills surveyed using a basic levelling technique.  It is now also benefiting from the accurate surveys conducted with GPS / GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data.

However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded.

In recent years, acronyms or short monikers referring to specific hill lists have become increasingly popular in hill-walking circles, and during the compilation of ‘The Welsh 500m P15s’ the authors have used the Welsh word ‘Uchaf (Higher)’ to refer to these hills, with the plural being ‘Uchafion’, since these summits take in the higher tier of the Welsh uplands.  This moniker will be used on the Mapping Mountains site to refer to this class of hill.

It seems fitting that the list of ‘The Welsh 500m P15s – 490m Subs should now benefit from a detailed Change Register, and although the hill list in its entirety is not yet published it is prudent for this Change Register to initially detail the changes to this sub category since the November 2015 introduction published on the Mapping Mountains site.

The Change Register to ‘The Welsh 500m P15s – 490m Subs appears below with the reclassifications to the 490m Subs list being detailed chronologically in receding order.




Change Register

The Welsh 500m P15s (Yr Uchafion) – 490m Subs






Twynau Gwynion    496.2m at SO 06765 10699

This hill’s reclassification was announced on the Mapping Mountains site on 10.01.17, with the hill previously listed as a 490m Sub-Uchaf with 16m of drop based on the 498m summit spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and a 482m bwlch spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website.  This hill was reclassified from a 490m Sub-Uchaf to a Double Sub-Uchaf from LIDAR data analysed by Aled Williams, resulting in the hill having a 496.2m summit and 481.3m bwlch height, with these values giving this hill 14.9m of drop which is insufficient for this hill to retain its 490m Sub-Uchaf status.  490m Sub-Uchaf total decreases by one and confirmed as 61.   
   



4th November 2015 – Mapping Mountains first publishes details to ‘The Welsh 500m P15s – 490m Subs

490m Subs total confirmed as 62.




Myrddyn Phillips and Aled Williams (January 2017)

Friday, 13 January 2017

Mapping Mountains – Hill Reclassifications – 500m Twmpau


Cwar yr Ystrad (SO 083 142)

There has been a new addition to the listing of Twmpau (thirty welsh metre prominences and upward) hills due to analysis of LIDAR data by Aled Williams.  The hill is listed in the 500m height band of Sub-Twmpau, with the criteria for the sub hills being 500m or more and below 600m in height with 20m or more and below 30m of drop.  Details to this height band of the Twmpau were published on the Mapping Mountains site on 15th June 2015.

The hill did not appear in the Sub-List which accompanied the original Welsh P30 listings on Geoff Crowder’s v-g.me website as the Sub-List only included hills whose map details showed that when surveyed they may stand a chance of qualification to the main P30 list, with the title of the Sub-List being ‘Hills to be surveyed.’  And as this hill is a part of a quarry current 1:50,000 and 1:25,000 Ordnance Survey maps do not give it any ring contours, as is the norm for areas of land that have been quarried.  The hill is of interest as it is only now listed as a Sub-Twmpau through the quarrying activities of past years that has resulted in producing a new bwlch for the hill.   Since first publication this Sub-List has been standardised and now includes all hills that have a minimum of 20m of drop and below 30m of drop.

The hill is situated in the southern part of the Bannau Brycheiniog (Brecon Beacons) group of hills with its Cardinal Hill being Pen y Fan (SO 012 215) and is placed in the Region of South Wales (C-2).  As its name suggests the hill is a part of a quarry with its qualification as a Sub-Twmpau partly due to past quarry activities, it is situated between the Pentwyn and Pontsticill Reservoirs to its west and the Talybont Reservoir to its north north-east, with the town of Merthyr Tudful to its south south-west and the small community of Trefil to its east south-east.

The hill can be accessed from a number of directions on public footpaths including from its south-west and from its north, whilst the route from the paved road north of Trefil also gives access onto the quarry track, but if wishing to ascend from this direction it should be noted that there is a barrier across the road beyond Trefil that is locked at 5.00pm and unlocked at 6.30am with online write ups stating this barrier is locked at weekends.

The name of the hill is Cwar yr Ystrad and its inclusion as a Sub-Twmpau is due to the analysis of LIDAR data by Aled.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Cwar yr Ystrad

Summit Height:  579.9m

Summit Grid Reference:  SO 08358 14245

Bwlch Height:  558.9m

Bwlch Grid Reference:  SO 08376 14189

Drop:  21.0m


Therefore, the 579.9m LIDAR data produced for the summit position at SO 08358 14245 and the 558.9m LIDAR data produced for the bwlch position at SO 08376 14189 is sufficient for this hill to be classified as a Sub-Twmpau with 21.0m of drop.

This now revises the total in the 500m Twmpau which will be updated accordingly.


The full details for the hill are:

Cardinal Hill:  Pen y Fan

Summit Height:  579.9m (LIDAR data)

Name:  Cwar yr Ystrad

OS 1:50,000 map:  160

Summit Grid Reference:  SO 08358 14245  
 
Drop:  21.0m (LIDAR data)



A wintry scene with the new 500m Sub-Twmpau Cwar yr Ystrad in the background with its summit directly above the roof of Ed's car

My thanks to Aled Williams for sending the details of this hill to me.


Myrddyn Phillips (January 2017)




Thursday, 12 January 2017

Mapping Mountains – Significant Height Revisions – Y Trechol and Y Pedwarau



Clepyn Melyn (SN 961 464)

This is the thirty seventh post under the heading of Significant Height Revisions, and the Trimble survey that resulted in this height revision was conducted on the 28th December 2016.

The thirty seventh major height revision initiated from a survey with the Trimble GeoXH 6000 was conducted in the hills of Mynydd Epynt in the south-easterly part of Mid and West Wales (Region B, Sub-Region B-2) on a beautiful winter’s morning with blue sky, frost and just a breath of breeze.  Large swathes of Mynydd Epynt is out of bounds for much of the year as it forms part of the Sennybridge Artillery Range Firing Area, and the hill range is positioned between those of Mynydd Du, Fforest Fawr, Bannau Brycheiniog (Brecon Beacons) and Mynyddoedd Duon (Black Mountains) to its south and the wilds of the Elenydd to its north.

The hill is situated just above the high point of the B 4519 as it climbs from the small community of Garth to the north toward the village of Upper Chapel to the south-east, the hill should only be ascended when it is appropriate to do so due to the presence of the military, otherwise it would be an easy ascent on a track from a car parking area near to the top of the road to the north-east of the summit.

The name of the hill is Clepyn Melyn and this was derived from local enquiry (see Significant Name Changes) and the survey conducted with the Trimble GeoXH 6000 was preceded with analysis of LIDAR data.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Clepyn Melyn

Summit Height:  475.5m

Summit Grid Reference:  SN 96120 46434

Prior to the analysis of LIDAR data and surveying the hill with the Trimble GeoXH 6000, Clepyn Melyn was listed as having a 478m summit height based on the spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, this height seems to be a relatively recent addition as no spot height is shown on any Ordnance Survey map examined prior to and including the historical 1:25,000 map.

Clepyn Melyn was surveyed with the Trimble GeoXH 6000 giving the hill the following details:


Summit Height:  475.7m (475.681m converted to OSGM15)

Summit Grid Reference:  SN 96124 46428


This is not a dramatic height revision when compared to some revised heights, but it does come within the parameters of the Significant Height Revisions used within this page heading, these parameters are:

The term ‘significant height revision’ applies to any listed hill whose Ordnance Survey summit spot height has a 2m or more discrepancy when compared to the surveyed Trimble height, also included are hills whose summit map data is missing an uppermost ring contour when compared to the data produced by the Trimble.  As heights on different scaled Ordnance Survey maps are not consistent the height given on the 1:25,000 map is being prioritised for detailing these revisions.

The summit of the hill consists of red grass that when last visited had been fenced with stakes and a single wire that is easy to either clamber under or as I found; over.  The ground hereabouts is mainly hidden by the length of the reed grass but the high point is accepted as being beside a small concrete pillar and this is where the Trimble was set up.  Therefore this hill’s new summit height as surveyed by the Trimble GeoXH 6000 is 475.7m (converted to OSGM15) which is 2.3m lower than its previously listed height of 478m which appears on the Ordnance Survey enlarged mapping on the Geograph website and the 1:50,000 Landranger and 1:25,000 Explorer maps.


The full details for the hill are:

Cardinal Hill:  Clepyn Melyn

Summit Height (New Height):  475.7m (converted to OSGM15)

Name:  Clepyn Melyn

OS 1:50,000 map:  147

Summit Grid Reference:  SN 96124 46428
  
Drop:  c 198


The Trimble GeoXH 6000 gathering data at the summit of Clepyn Melyn (SN 961 464) which resulted in this hill's significant height revision




Myrddyn Phillips and Aled Williams (January 2017)

Wednesday, 11 January 2017

Change Register - The Welsh 500m P15s - 500m Subs


Change Register

The Welsh 500m P15s
500m Subs

All hills in Wales at or above 500m in height with a minimum prominence of 15m; from the 500m summit of Esgair Saeson to the 1085m summit of Yr Wyddfa


The Welsh 500m P15s is a hill list co-authored by Myrddyn Phillips and Aled Williams, and was first announced on the Mapping Mountains site on 4th November 2015 where a complete breakdown of hill totals was listed by Group.  The list then comprised of 630 hills within the main list that met the qualifying criteria with over 100 of these hills making their first known appearance in any form of hill list; emphasising the fact that this listing is the most comprehensive of its kind for this height band of hill in Wales.

The listing originated in 2004 at which time it included a sub hill category for those hills that met the qualifying height but only had 14m or more and below 15m of drop, these are now known as the 500m Subs.  Since the listing originated it has developed ever since with over 330 marginal hills having been surveyed using a basic levelling technique.  It is now benefiting from the accurate surveys conducted with GPS / GNSS receiver, an expanded range of Ordnance Survey maps available online and most recently, by analysis of LIDAR data.

However, it is not just numerical data that has seen this list develop since its first inception, it is also place-name data, and it was because of this and their mutual interest in hill lists that the authors first corresponded.

In recent years, acronyms or short monikers referring to specific hill lists have become increasingly popular in hill-walking circles, and during the compilation of ‘The Welsh 500m P15s’ the authors have used the Welsh word ‘Uchaf (Higher)’ to refer to these hills, with the plural being ‘Uchafion’, since these summits take in the higher tier of the Welsh uplands.  This moniker will be used on the Mapping Mountains site to refer to this class of hill.

It seems fitting that the list of ‘The Welsh 500m P15s – 500m Subs should now benefit from a detailed Change Register, and although the hill list in its entirety is not yet published it is prudent for this Change Register to initially detail the changes to this sub category since the November 2015 introduction published on the Mapping Mountains site.

The Change Register to ‘The Welsh 500m P15s – 500m Subs appears below with the reclassifications to the 500m Subs list being detailed chronologically in receding order.




Change Register

The Welsh 500m P15s (Yr Uchafion) – 500m Subs






Pt. 637.4m    637.4m at SO 26698 32276

Pt. 637.4m is now reclassified to a 500m Sub-Uchaf

This reclassification was announced on the Mapping Mountains site on 30.11.16, with the hill previously listed as an Uchaf with c 15m of drop based on the 637m summit spot height on Ordnance Survey maps and an estimated bwlch height based on contour interpolation of c 622m.  This hill was reclassified from an Uchaf to a 500m Sub-Uchaf from LIDAR data analysed by Aled Williams, who had analysed this hill’s data independent of Joe Nuttall who was the first person to scrutinise this hill with LIDAR data, both found that the hill was given less than 15m of drop with Aled’s analysis producing a 637.4m summit and 622.6m bwlch height, with these values giving the hill only 14.8m of drop which is insufficient to retain its Uchaf status.  500m Sub-Uchaf total increases by one and confirmed as 24.  

   



Graig Fach    513.1m at SN 82140 93168

Graig Fach entered the ranks of Uchafion via a basic levelling survey and it has now been reclassified to the ranks of 500m Sub-Uchaf via a Trimble GeoXH 6000 survey

The first Uchaf to have been reclassified to a 500m Sub-Uchaf by surveying with the Trimble GeoXH 6000 since details of the list were made public in November 2015.  This status change was announced via the Mapping Mountains site on 21.05.16, the hill had been previously listed as an Uchaf based on the 514m summit spot height appearing on Ordnance Survey 1:25,000 Explorer maps coupled with a basic levelling survey conducted by Myrddyn Phillips on 22.05.04 resulting in 56ft 6(17.2m) of drop.  This hill was subsequently surveyed with the Trimble GeoXH 6000 by Myrddyn Phillips on 05.05.16, resulting in the hill having 14.5m of drop, which is insufficient for qualification as an Uchaf500m Sub-Uchaf total increases by one and confirmed as 23.




4th November 2015 – Mapping Mountains first publishes details to ‘The Welsh 500m P15s – 500m Subs

500m Sub-Uchaf total confirmed as 22.




Myrddyn Phillips and Aled Williams (January 2017)