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Check out the small crab on the left in this one:
I think it has the strong clefts towards the outer ends of the carapace of Xantho pilipes?
Cant say the same for the larger crab in my observation, I think it might be P.hirtellus, no clefts.
Lat/Lng: 51.6711, -4.6928
OS grid ref: SN138003