This is all I've got on this one, maybe the leaves are a key feature
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- would be my guess (Stellaria media), but I can't see the stems. They have two lines of hairs, like germander speedwell. The leaves are pale green, and the deeply-notched petals are shorter than the sepals - both match the description.
Hairs are not opposite on the stem as in some speedwells
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Sorry - my sloppy description. The hairs are in one line, not two, but it usually alternates at the leaf nodes. I had to check this - not really paid attention to chickweed for years, having inherited a garden full at one time.
Lat/Lng: 52.1, -3.4
OS grid ref: SO0451