Coming to the conclusion that geocaching may be better left to lightplaces. There is plenty to see and do undergorund already. There wouldn't be any problem having them in mining areas (there is actually one near Rhosydd) where top explorers who were then more interested in the area, history etc could use one of these fine sites to find more info and get underground safely (this rings a bell as it is how I got into this game, not thru geocahching, but walking, staying in these areas etc)
As for the £20....now thats a different story :devil:
(as long as they are not the old 20's!!)
May the fleas of a thousand camels infest the crotch of the person who
screws up your day and may their arms be too short to scratch.