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... what with the asymmetrical base to the leaves, which are held alternately.
Spindle (Euonymous) have leaves held in opposite pairs, and are much more slender than this stout fellow.
I'm sure I've seen this somewhere before, with those distinctive big brown buds, but I can't remember where.. will keep looking!
*rushes off to google images*
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
I recommend a walk of York city walls to any tree fan,a fine collection of exotics all the
Lat/Lng: 53.9606, -1.0825
OS grid ref: SE602520
approx location again