Growing in damp, tall ruderal sward which has been seeded.
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Did you get a picture of a seed pod,as they help with id,smooth has usually four seed's in the pod,pod is smooth too.Have agreed but is useful for further ob's as the Pea family is rather tricky.
I don't think there were any pods there, i'll have a look though for confirmation, thanks
Lat/Lng: 53.4, -2.9
OS grid ref: SJ4190