I am gobsmacked, it is such a totally typical example of a beech tree one of our most common trees and we are all here discussing. Its out in the middle of a field on it's own, almost certainly planted, its growing on an exposed hillside so is probably growing pretty slow (never see an alder there) hornbeam uncommon in South wales and more fissured bark and trunk when old, sycamore very different old bark, leaves and wood colour. I guess it is 150 years old which fits with the end of the period when most beech trees were being planted, the smooth bark on branches and slightly rougher on old trunk all fit, the leaves are right, so is the colour of the cut branches. The form of the trunk is exactly typical. The only thing that is a bit bizarre is why it has been so drastically pruned for no obvious reason, during the growing season, and with nasty long pruning stubs too.