Just thought on if the MI is post 1855 it may not be in the booklet, doh  
Correct !  I was involved with publishing this DGFHS booklet and took photographs of most of the readable stones in this old graveyard.  I have had a look through our archive and find the latest date on a memorial as 1932.  (see photo)
I don't think it can ever be said for certain that an inscription actually represents a burial in any lair.
These stones are family memorials and can often refer to family members buried elsewhere.
In this case though I would assume that this is the burial of Margaret Elizabeth Forrester aged 83.
So 1932 seems to be the latest date recorded on a stone in this graveyard.
Cheers,
Sy