Seen among Barley at field boundary. Certain it is a fumitory but not sure which.
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With the recurved flowers, it is probably Fumaria capreolata but there are others that do that.
purpurea was also the suggestion of Sarah Whild at FSC. Broadly, the size, recurved pedicels and upcurving margin of the upper petal help key.
capreolata and purpurea both have drooping flowers, but capreolata has ovate not oblong sepals, and also a green keel which is visible along the length of the upturned wings - this is purpurea.
Lat/Lng: 53.4, -2.8
OS grid ref: SJ5299