Send a message to the person who requested a photo of the grave monument of Ralph Alister Rever with the following comment:
To locate it so as to check widow's name believed to be on an adjacent (not listed) stone. I am a) Adding her bequest into a book displayed in the church and b) Checking the Church Burial Register and Database, the latter soon to be put on the web after which it can be cross-referenced to your records.