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Thanks for this id. I feel so stupid. i didn't even think that it might be Herb-Robert, probably because there were no flowers!
Until you have your eye in Geranium robertianum foliage can be confused with the foliage of a number of other plants (e.g. some umbellifers); it can even look rather fern-like.
A useful technique for identifying it is to brush your hand against the foliage, and then sniff your hand - the foliage of Geranium robertianum has a characteristic rank smell.
Thanks for this additional information. Did you mean 'G. rotundifolium' or 'G. robertianum' in your final comment?
I think that I was unaware that G. robertianum foliage is sometimes red - now I know better!
I meant G. robertianum above (corrected above).
Thanks. That's what I thought!
Lat/Lng: 54.3523, -3.0602
OS grid ref: SD311957