Afan and Cwm Carn are well known trail centres in south Wales. I called in at both during the Christmas holiday in 2010. The Afan trip was organised by DIRT club (Facebook group, website)
Ride reports and information about Afan: White’s Level and Skyline May 2010
Ride report and information about Cwm Carn: July 2010, April 2010.
all about MTB in and around Swindon and North Wiltshire, including the Croft MTB Trail