http://www.heart.co.uk/somerset/news/local/wookey-hole-caves-graffiti-attack/
I've posted this as a news item but would be genuinely interested to hear the views of others. The owner of the caves thinks it may be a Banksy stunt as it has been done by a talented artist.
My view is - not in the caves. They don't need anything to detract from their natural wonder.