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The marking along the side suggest this genus to me, but i think the caterpillar itself is at too early a stage (certainly for me) to suggest a species level it.
The three Acronicta, A. menyanthidis, A. euphorbiae and A. rumicis all seem to have this dark body/hair with a red/white side stripe though in an adult these are quite different at this stage i can't be certain..
However, at a push i would be leaning towards A. menyanthidis due to the lack of white hairs or white in the side stripe..
Lat/Lng: 51.3, 0.0
OS grid ref: TQ4367