The tree kind of resembles an ash but has green buds, there are pinnate leaflets with rounded tips
close up of leaflets
This tree is located in Cambidgeshire in the United Kingdom
I would say it is a walnut tree. The bole is flat, and at first sight it seems that someone cut the lower branches of it (at some point when the tree was younger). The leaves also look like the ones of walnut.
If it has no fruits on the branches then it might be a bad year, or some hail destroyed the harvest, or the tree might have some illness (see points on the lower leaves).
Disclaimer: I am not a botanist, we just have a lot of walnut trees in our orchard.