similar to teasel and dock in appearance
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...but the central ribs should be white, not red, and the leaf would have tiny prickles on it, projecting upwards.
Looks almost like Sorrel, but in that case the veins would be red, as well as the central rib.
Not sure about this one, but it looks hauntingly familiar... *prepares to kick self when ID is made*
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
maybe one of the lettuces?
Lat/Lng: 52.3, -0.9
OS grid ref: SP7567