A feature about removing loose rocks around Smoo Cave was on the One Show tonight. It'son iPlayer from ~25 mins on:
http://www.bbc.co.uk/iplayer/episode/b03hvj0y/The_One_Show_19_11_2013/
http://www.bbc.co.uk/iplayer/episode/b03hvj0y/The_One_Show_19_11_2013/