hi Rog
thanks for the info in the PM. Yes, i checked Marl Pit Hill when i visited and it does seem that all the graves there are more recent.
I actually think the photo is taken much later than the actual burial. I've looked at photos from around the turn of the century and the ladies hats seem to be closer to that period than the 1880's (If anyone disagrees please put me right).
If the fellow on the far right next to the headstone is Thomas' son William (this is by no means certain, their were other sons), his wife passed away in 1898, her absence from the picture would suggest later than that date.
Anyway i'll leave it for a few days and then do as you suggest and try a lookup for the MI.
Many thanks for your time.