Hello Norrie,
When you've got a minute can you please check to see if you details of any of the following?
James Leitch & Isabella Lambert.  I have no death record for him but she was buried in Dysart Barony 18 Apr 1859, having died 4 days earlier in Riddles Close, Leith.  Perhaps his name was added to her stone.  However, he was a sailor so may not be buried here.
John Leitch & Sophia Penman.  Although he was born in Dunfermilne he is possibly buried in Abbotshall as he lived most of his life as a coal grieve there.
David Lambert & Margaret Dewar.  I have no death record for her but he died 15 Mar 1828 and the OPR 399, Book 6, page 118 says "Buried in the middle position grave of his property, 6 foot deep"
Many thanks in advance and kind regards to you,
Jack