Bummocks... the paragraph with the link vanished.

The Edge is Alderley Edge , near Wilmslow in Cheshire, UK. It's a natural escarpment which has been used since Bronze Age times as mineral mines. There are some 18 miles of caves under those hills, some only accessible by crawling flat - just as described in Alan Garner's book 'The Weirdstone of Brisingmen'. It's a bit of a walk up wooded slopes and the sandstone rocks can be a bit treacherous as they tend to sandpaper your knees if you fall....

LTS