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I agree the leaves look like Moschatel (more than Herb Robert to me) but it's difficult to say without a picture of the flower. If there were no flowers, that is suspicious because Moschatel should be in flower right now (and is, round here).
moschatel isn't hairy and doesn't have 5-obed leaves though
It has been quite cold here and this was beneath coppiced trees so quite shaded, there aren't many things flowering there at the moment. I don't think it is herb robert as I have seen that in the wood too and it looked quite different. Difficult to tell from the picture perhaps but I believe herb robert has more pinnately-cut leaves and are less rounded than those of this plant?
I have since found this again and it is definitely herb robert. Thanks
Lat/Lng: 52.5596, 0.8397
OS grid ref: TL925995