Mystery tree question from a newbie

Hi all.
I'm new to allotment gardening and I would like to ask for some help identifying two trees on my small plot. I think one is a plum but I have never seen either of them fruit or in flower and both are heavily disguised  byt a thick layer of ivy, bramble and bindweed. Can someone advise both on identification and also on how to care for these trees so they might eventually produce something tasty!?
I'd really appreciate any help or suggestions. I have posted to the gallery so hopefully those images will appear soon on the above link.
Best,

Lorna

Thanks for your advice-pruning is a bit of a pain at the moment because the tree is so heavily overgrown with ivy bramble and bindweed, and in a fairly awkward spot. I assume I prune at the onset of winter and perhaps then I'll just wait and see what fruits!

I agree with Salmo - for now I'd just clear everything else away from it and wait and see what next spring brings.

After that you'll have a better idea of what it is and how it performs. With that knowledge you can then make pruning decisions.

I'm going to go right out on a limb here   I think it has the look of a quince.

Cheers,   Tony.