small white flower
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Flowers too small for Cuckoo flower. Which flowers in mid to late April.
Wild Flower Society member
Closer examination of photograph shows wrong type of leaf for plant to be shepherds purse.
Probably Danish Scurvy grass.
No, its got the wrong leaves and flower for Danish Scurvygrass - if you compare with the photos on the link below you'll see the difference:
Lat/Lng: 52.0, -0.6
OS grid ref: TL0041