In the late '70s/early '80s 22 and 202 Sqn Whirlwinds and Wessex then Sea Kings used to do exchanges, with the Alouette 111 going to Brawdy or Valley for a few days. I remember one of the SAR crewmen telling me on his return that he'd been through a 'winchmans alley' on the end of a long cable underneath a Sea King, they'd given him a static discharge rod to touch the slate walls of the alley every now and then to discharge the static build up. He said he touched the rod against the cliff and there was a blinding flash and he thought he'd been given an arc welding rod! There were always plenty of Special Branch cops around when the RAF lads were in, sad isn't it!