archaos: As much as it saddens me, I went to get this back on track today, to find the whole section where the cache is hidden to be cordoned off for safety reasons, due to crumbling walls.
As i cannot see this being fixed in the imminent future I am having to archive it, although hopefully I may be able to do something similar again.
Thanks to all who have visited, finders and DNFs (for there were plenty!) , and to Jim for transferring it to me.
Bye Bye.