Surprised that this has not been mentioned here: -
"An archaeologist believes a wall carving in a south Wales cave could be Britain's oldest example of rock art.
The faint scratchings of a speared reindeer are believed to have been carved by a hunter-gatherer in the Ice Age more than 14,000 years ago.
The archaeologist who found the carving on the Gower peninsula, Dr George Nash, called it "very, very exciting."
http://www.bbc.co.uk/news/uk-wales-south-west-wales-14272126
and more detail here: -
http://www.bristol.ac.uk/news/2011/7812.html
"An archaeologist believes a wall carving in a south Wales cave could be Britain's oldest example of rock art.
The faint scratchings of a speared reindeer are believed to have been carved by a hunter-gatherer in the Ice Age more than 14,000 years ago.
The archaeologist who found the carving on the Gower peninsula, Dr George Nash, called it "very, very exciting."
http://www.bbc.co.uk/news/uk-wales-south-west-wales-14272126
and more detail here: -
http://www.bristol.ac.uk/news/2011/7812.html