Conqueror, grandad of the Chieftain and Challenger series of British tanks.
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Details:
http://www.tanks-encyclopedia.com/coldwar/UK/FV-214_Conqueror.php
wasnt that the tank that was too heavy for half the bridges in Europe? as a kid I recall a Might Antar Mk II attempting (barely successfully) to haul a Conqueror up a very small grade in Farnham Surrey ... not too far from Aldershot