Hilary, Well you got a good result in that you got some solid facts.
I had a sort of vice versa case....
My grandfather was buried in 1942, in a "purchased" grave in the graveyard of a small church near Blyth. There was a headstone, which I remember seeing regularly as a child.
Later my grandmother in 1950s was buried in the civil cemetery, as the church cem was full. ( This attracted many complaints from the family who said that the original grave site had been purchased and there was room for her!)
Later there was some roadstraightening which cut away about a quarter of the church graveyard. The tale was that all the folk in that section of the graveyard were reburied in the civic cemetery. About the same time, 1960/70s, many headstones were taken down/removed/broken though vandalism or whatever.
Then at some time later my grandmother's headstone in the civic cemetery gained an inscription about my grandfather.
When I started family history research, I made enquiries about this, such as who had commissioned, paid for this etc, to be told by cemetery authorities that nobody was reburied from the Catholic cemetery and the road just goes over them.
So my grandfather is under the road, but his MI is in another cemetery.
Michael Dixon