There's a little covered seating area about half way along Black's Link, which is a good sport to stop for a drink if you're hiking this area in the summer. But in the back wall, Craig pointed out a metal fixture:
These are common to many of the British military buildings (eg pill boxes, spliter-proof shelters), and were the hinges for folding beds. Does anyone know which type of building was here originally?
Here's the wider view, which you'll probably recognise: