heh, thanks. I think the tree's a goner. It had a handful of fruit, early, then seemed to just give up halfway through June. Worryingly, the cherry tree also did an early shed of leaves after a bit of fruiting. Now going out to dig around and see if there's any evidence of bootlaces there. UGH.
I think I’ve got a honey fungus infestation growing on the plum tree out back. This would explain the tree’s very ‘2020’ behaviour I guess.