From an article published on the BBC News web site on 29th June 2012:
A reindeer engraved on the wall of a cave in south Wales has been confirmed as the oldest known rock art in Britain.
The image in Cathole Cave on Gower, south Wales was created at least 14,000 years ago, said Bristol University.
Archaeologist Dr George Nash found the engraving while exploring a rear section of the cave in September 2010.
He said uranium dating showed it was the oldest rock art in the British Isles, if not north-western Europe.
Full article, with photo, at bbc.co.uk/news/uk-wales-south-west-wales-18648683