In reply to Ffion Blethyn:
It's on the L wall of a cave near Menachurch Point. Their (the bolts) days are numbered. Thanks to Gareth Palmer who removed the mysterious bolts at Carn Gowla as far as I know these, a few rusting relics on The Haze, also at CG and a micro route or two near Widemouth, are the only bolts in over 100 miles of sea cliff on the N coast.