Rosie, I think yours are safe - Your Gt Gt Grandad is probably leaning against the back wall, Either having a fag, or waiting for some little old lady to walk by.......?
As you go uphill, you will see there is a space between the back wall of Publics and the Wall of the Mint - good place to put the surplus soil, compost covering the walls of the Publics - treat it as a ground level window box!!!!!
You can probably just scrape around the surface with a spade, or work your way down from further up where the walls are showing and just follow the back one down.
Dunno what the area looked like between 1920-1950 - Grass or flower Beds? Most of the trees date from late 1950's, early '60's when the Council had finished and just left the disturbed soil to sprout madly. As you say looking much better now, would be nicer if the people converting the Mint tidied up the brickwork on top of the retaining wall. they have done work up near the compost area, but stopped after a few yards.
WEndy, the hard parts are 1) Finding a grave or 2 with numbers on to start counting down and across to locate your grave in first instance, and b) Remembering to pick your folder up afterwards with all your info in!
I have left 3 behind over time and only found 1 of them when I remembered and returned! Having to print out all the sections plans and pics is a pain!
When answering requests for locating graves, I try and take pics from several directions so they can find the space again. I also have a smakll supply of 2 x 2 timber which I use as Markers if they are visiting soon after to have a look.
Be careful on Section H - some nasty sunken graves there - more candidates for surplus soil from off the Publics.!!!!!!!!!
Brian