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Corystes cassivelaunus
The masked crab (also known as the sand crab) has an elongated carapace, which is reddish brown to yellow in colour, and sometimes features patterns that look like a face (2). The bristly antennae are considerably longer than the carapace. The first pair of 'pereopods' (walking limbs) have pincers, and are roughly twice the length of the carapace in males, but are about the same length as the carapace in females.
West Wittering beach in Chichester, UK
Your help with an ID would be most appreciated!