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My first thought was cherry as well, but the infloresence seems quite long - does this fit with any particular type?
It isn't easy to tell, but the flowers do not appear to be part of one inflorescence, rather that they are tightly clustered on one twig/branch.
P. padus has large drooping racemes but this is not P. padus (or at least not in any normal form).
Huge numbers of Prunus (and Malus) have been hybridised and selected for ornament, not least profuse flowering,)so unless you happen to know this one of the thousands of forms (assuming it is Prunus), you may never know what it is.
Lat/Lng: 52.4, -1.9
OS grid ref: SP1188