I think this is a lilac but am not sure....
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...if I had to bet I'd go for a shrubby honeysuckle of some kind (such as Lonicera x purpusii or L.tartarica)
I hav another in my front garden I'll get a photo of that, it still has last yrs seeds attached mayb that will help, keep tuned.. I'll repost in the nxt few days.. xx
Could be Philadelphus but need closer detail of leaves.
Lat/Lng: 50.7, -1.2
OS grid ref: SZ5889