This is a flower from a hawthorn that was just comming out.
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This is astonishingly early for Hawthorn (it is not called 'May' for nothing). What made it Hawthorn and not Blackthorn Prunus spinosa?
Probably not Crateagus monogyna much too early and we are having a late spring
Wild Flower Society member
Were the leaves out? Blackthorn flowers before it comes into leaf and hawthorn after.
Here's a link to some photo's etc for Cherry Plum, P. cerasifera:
Lat/Lng: 51.6, 0.5
OS grid ref: TQ7996