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I can't think of anything else it might be other than Charlock. It has very bristly leaves - not nice to pick!
Thanks for confirmation. Slight uncertainty was in comparison to other pictures I'd seen, variation in heights and spread and flower clusters .
Charlock is very variable. I have seen some specimens only a few centimetres tall and others well over five feet. I suppose, growing conditions play a key role.
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
Lat/Lng: 53.7, -1.6
OS grid ref: SE2933