Hi G
Slightly off topic but in the general area.
Have you ever seen the healing stones of St Fillan in the museum at Killin?
I only read about them recently.
Just wondered if they were 100% natural?
I can only find a dodgy photo on the WWW that doesn't really give scale but it looks like there may be a couple of cup-ish depressions in a couple of them.

cheers
fitz