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It's a pity you didn't take a close up of the buds. It resembles Fraxinus ornus, but you can't tell from this picture. F. ornus has brown, rather than, black buds.
...I always like a close-up of the buds.
F. ornus buds are not so much brown, as pinkish-brown, btw, as opposed to the strongly brown buds of F. angustifolia (Narrow Leaved Ash).
Also, F. ornus buds are quite hairy, with soft greyish hairs all over the buds.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
... perhaps I should take a look at the local sites for Fraxinus angustifolia (cultivated) and Fraxinus ornus (status unknown).
...it would be good to have some comparison observations.
I'm going to looking around at the weekend, too!
The F. angustifolia is 3 miles away, and the F. ornus 6 miles away, so it's a matter of waiting until I'm walking in those directions.
Lat/Lng: 50.9767, -3.2202
OS grid ref: ST144204