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Not, I would have thought, M. sylvestris, which has the calyx glabrous. So most likely M. pumila (the newish name for M. domestica) which has hairy calyces. But it might of course be some other cultivated species, but one would need fruits to tell.
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... made me think that it might have been one of the ornamental crab species, but as the buds of Malus are redder than the open flowers, I wasn't sure that they were red enough to exclude Malus pumila.
Lat/Lng: 50.7318, -3.4948
OS grid ref: SX946935