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Found it washed up on Weymouth Beach today. Not sure what it is...
The square end & hint of a hinge point towards crab exoskeleton, ie the pivoting part of a crab's claw. I'd say edible crab, though at about 9cm it's very large.
However see http://beaubeen.wordpress.com/2008/07/03/lagrest-edible-crab-ever/