Recently there was long thread about the BCA. I can now post possible answers to some of the questions, such as "Why is the BCA still raising membership prices when there is a significant amount still left in its coffers?"
At 19 mins, in Gwaun Valley mine (their seals can also be found in caves):
https://www.bbc.co.uk/iplayer/episode/p09mrr1c/iolos-pembrokeshire-series-1-episode-4
