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The third photograph is Stellaria media
Thanks. I thought that maybe I had more than one plant here (I have quite a few other pics), but wasn't sure. Is it etiquette to remove the 'wrong' photo and re-post (I can add to it)?
... with you removing the last photograph provided the action is documented. If you feel nervous about this check out the etiquette pages, though I suspect that they will be silent on this point.
Apart from the difference in leaf shapes, Cerastium leaves are hairy, while those of Stellaria media at least appear glabrous.
I've removed the final photo and posted a separate id for Common Chickweed.
Lat/Lng: 53.62724, -2.35275
OS grid ref: SD767145
Growing on open farmland.