With its enormous legs and lethal claws, this monster of the deep is already the biggest crab ever seen in Britain.

But astonishingly, the arthropod - which measures a staggering 10ft from claw to claw - is still growing, and could live until it is 100.

Nicknamed 'Crabzilla' after the fictional giant monster, the Japanese Spider Crab has a body the size of a basketball and its legs can straddle a car. They will eventually measure a massive 15ft.

Crabzilla: Derek Scales from the National Sealife Centre in Birmingham with the biggest crab in Britain