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...pinnate leaves, silver-grey bark, small seedling somewhat contorted and damaged but still growing strongly: looks as though it's in your garden - could well be!
Go on, put up an ID (Fraxinus excelsior) and see if we agree with you!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Black buds, coming into leaf late and abundant self-sown seedlings are also characteristics of ashes.
Lat/Lng: 51.8, -0.9
OS grid ref: SP8112