I've been hunting across tinterweb for the identity of our"crabapples".
Looks like they are malus sylvestris. In other words plain wild apples, not feral, with something giving them red spots.....
The old road they grow alongside IS very old indeed. So the trees could be at least three hundred years old...or bird sown descendants of the originals.
Pretty gnarly anyway, and in a rather windswept spot, so rather stunted.