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...has rounded bracts - these appear to be very pointed, so it's more likely to be one of the Kousa dogwoods.
Which means you get those lovely geodesic fruits!
Being pinky-white rather than greeny-white, I'd say it's more likely to be C. kousa var chinensis. Greeny-white bracts would indicate C kousa.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Jumped in before engaging brain!
I do that all the time!
You were, however, very much in the right family, so you can take a virtual housepoint for that.
Lat/Lng: 51.5, -2.5
OS grid ref: ST6781