I get niggled by this tealights thing. Surely a tealight has to be VERY close to a stone to make the slightest damage. All the tealights I've ever seen are on ledges or floors, and would do no damage at all.
A post on here once had people moaning at a photographer for not removing tealights that weren't even theirs when they took the photo. The tealights were on the floor of West Kennet doing no damage at all.
I know that heat rises, and even a tealight can give off quite a bit of heat up to a foot above it in a poorly ventilated area - but I think we should have further evidence of the proximity of tealights to stones before we sent out the tealight police.