Hi Marie, just reading your comments and agree we are much more laid back over here (in Oz), and apart from historically important cemeteries like Rookwood in Sydney, as long as you are not intentionally desecrating a grave I think pretty much anything goes in terms of restoration/clearing/cleaning etc!
I went to London last year for a few months (studying) and was quite close to the old Camberwell cemetery, so decided to visit one lunchtime (having written to the local council beforehand and got a map showing where my grave of interest was located). When I walked in the gates I was pleasantly surprised, everything was well-kept and there were workers tidying up about the place, nice paths, little buildings etc. But then I turned off about 50 yards inside the gates, onto a little gravel path leading between VERY overgrown plots...the first row on either side of the path was cleared, but after that it was thick brambles, HUGE rosebushes (honestly, I've never seen anything like it!!) and reasonable sized trees growing all over and between the graves! I had to find one that was 3 rows in, and then when I found it the stone was face down on the grave!!!
I took two distant cousins there a few weeks later, and we turned the stone over so we could read it (after taking secateurs and knives to clear a path!) but most of the face of the stone had rotted away into the earth - it had obviously fallen a long time ago. However, we made out some of the names and other text (we knew who had been buried there from the cemetery records)...we decided to leave the stone up - we and our immediate families are the only descendants of the people in the grave, so we felt it was our right to leave the stone upright and visible, if it had been in better condition we might have laid it down again to preserve the carving, but so much of it was gone we preferred to have it standing so it could at least be seen from the path.
I was really saddened by the state of about 80% of the old Camberwell cemetery. The same, I believe, goes for many of the very large Victorian urban cemeteries in London. The letter I had from the council indicated that the grave was in a "conservation" area - when I first read that I thought "oh good, they are conserving all the graves so it will be in great condition!" - how wrong I was!
Gosh, what a rambling post that was

Have attached a pic of part of the stone so you can see the state it was in. I asked the council if I could lift it and they said I could basically do what i liked with it.
Prue