In my youth I used to be into canal restoration, and one of the projects that we hhelped with was digging out the sand mines under Alderley Edge Which over the centuaries have been back filled, and silted up. A lot of the stuff mentioned in the song and ledgends are true. The sand mines exist and date back to Bronze age time, they have found deer antlers that were used to dig out the copper ore. There are huge caverns down there. The really spooky thing is that the soft sand stone absorbs sound so you cant hear someone who is 10 or 15 yds away down a passage way. There is a smashing (childrens)book by Alan Garner called "The Wierd Stone of Brisingerman"(spelling ?)Gives you a good feel for the place