Hi Gerry,
I stumbled across this and realised it must be 20 years since I took my late aunt to visit her grandparent's graves at Old Dalbeth. We found the chap in the lodge very helpful as he got the big register out and we found the lair numbers. However, the spot we tried to get at was totally overgrown with bushes(Rhoddies, I think). My aunt remembered going with her mum every Easter to Dalbeth. The children had a picnic while their mum, an artist, repainted the gold lettering. Do you have a photo with their headstone on it? They were Thomas Brown, 1845 to 1893 and Margaret McElwee Brown,1845 to 1896. Fingers crossed.
Moira