My knowledge of trees is a little more ropey. I can identify the most common ones (oak, sycamore, beech, silver birch, cherry, elder, willow, hawthorne, holly, poplar etc) by either leaves, bark or other key features, but I am shockingly bad at identifying trees in winter.
The Dendrologist (a journal sadly no longer printed) has this handy winter twig identification guide, which doesn't really help with these photographs, but might if I go out collecting twigs instead. There is also perhaps a more useful dichotomous key from Virginia Tech Dendrology department, although it is obviously North American, so I am not sure how much the species differ.
Of course, it's easier with leaves. Country Life magazine has a simple pictorial guide to the most common species, and the Forestry Commission has a tree name trail - pretty much exactly what I was looking for but using leaves rather than twig shapes. I'll make sure to come back to that in the summer.