Posted: 02/06/2014 at 17:06
It looks like an appletree to me. I bet it's never been fed poor thing. I'd rake all that gravel away and give it a good feed of Fish Blood & Bone (as directed on the pack) and a couple of buckets of water, then a good mulching with well rotted farmyard manure (not touching the trunk). In the autumn another feed of FB&B, and between now and then a couple of buckets of water every couple of days in hot dry spells.
That'll make it feel happier and more able to fight off any pests/diseased that are about.
Hopefully someone else more knowledgeable than me about pruning fruit trees will be along soon with some ideas about thinning the branches out .