I emailed the cemetery today and I've just received a reply, not only that they were kind enough to attach a photo!
I gave them the info I found of the cemetery website (search burials) Robert and Mary Millar etc
The headstone reads
In loving memory of our dear parents Robert McCrea died 8th December 1969.
Mary Ann (May) died 10th December 1992.
The Millar threw me a little because I was expecting to read Robert Millar's details, why would the inscription read McCrea , do you have any idea?