This is the only species commonly found between high and low tide; there are many others lower down the shore. The photo shows 2 features that confirm its ID as P.bernhardus - the points on the rostrum (between and to each side of the eye-stalks) and the 2 rows of tubercules on the main claw (just visible where the claw disappears into the sand).
Mike - is this a stereo pair or have you made a mistake?
The right claw of the common hermit crab is larger than the left claw - Pagurus bernhardus.
ðj (trawling history)
Lat/Lng: 52.975128, 0.610219
OS grid ref: TF753451