Gravestones and Mirrors
 

This link Mirrors trick

shows a great way to read the hard to read gravestones.

Granted it might be a bit cumbersome but I can see it being useful

I think you would get very odd looks carrying a full-length through a graveyard!

Very true. I'll make OH do that bit lol

Ever seen the results achieved with medieval graffitti?

I think they use strong led torches at an angle. Probably slightly easier.