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the sepals are the defining characteristics when it comes to pinning down Fumaria to species level. That and how the pedicel meets the fruit. T.G.C Rich and A.C Jermy's Plant Crib is invaluable for this. Just thought I'd share that with anyone interested.
I agree that this is probably F. officinalis, however the first important characteristic where Fumaria are concerned is the corolla size. So without a scale to go by I would not really like to attempt an identification. I agree that he Plant Crib is excellent (and free!) but we also now have the BSBI handbook written by the accepted UK expert Rose Murphy, which is really the business!
BSBI VC Recorder
Thanks for the update Tim, very common on the arable land when I took it a few years ago!
Lat/Lng: 52.2, -3.4
OS grid ref: SO0560