Dr George Nash from the University of Bristol and Welsh Rock Art Organisation WRAO has led a team of archaeologists at Barclodiad y Gawres, a prehistoric burial-ritual site on Anglesey, for the past four years.

Engraved rock art at the site is regarded as one of the finest examples of later prehistoric engraved art in the British Isles.

The engravings date to the Neolithic period and are around 5,000 years old.

read more: Neolithic art given a modern makeover on Anglesey – Wales Online.