I found this rather interesting crab under a rock on the Northumberland coast - It was approx 1-1.25 inches in diameter, and had bristly/hairy fringes to its legs and claws. I have seen a few crabs over the years, but never one with a carapace this shape. The carapace was hard, As you can see the claws are disproportionately large. Its legs were uneven shape with spikes in places, you can see one in the image on the top right (rear) leg. I would describe its pattern as greeny-grey/brown/black mottled, and there is that small eye shaped marking at the tail end of its carapace. The underside was a light grey-brown-beige colour with the 'tail' area being more brown, as were the areas around its joints.
Thanks for your help identifying it. I have a short video I can post if thats any help but it doesnt show the underside.
Hello, I believe this could be the Broad Clawed Porcelain Crab, Porcellana platycheles.
Hope this helps