Just came across this thread and read with interest. Several of my ancestors are buried in this cemetery - so far the ones I've found have been children or babies - and I found the articles in the links fascinating.
I was born in 1965 and remember the headstones being propped up against the wall on the left of the garden, so they must have been there for quite some time before being removed and destroyed, otherwise I don't think I'd have remembered them.
It's upsetting to think they were destroyed, although I doubt whether any of my ancestors' graves were marked with a stone so I don't think there would have been anything of relevance to me, but to just destroy them I think is wrong. They could have been laid as a path somewhere in the gardens, that would have preserved them for at least some time to come, wouldn't it?