The south-coast town of Walmington-on-Sea is being defended by a band of volunteers known as Dad’s Army, who patrol the beach in search of illegal immigrants arriving by boat. So far, the only boat they have apprehended belongs to a local fisherman, who was captured by the platoon, and forced to surrender his haddock.The group's captain, George Mainwaring, spoke to reporters yesterday. 'We’re the last line of defence for this country,' he declared, tripping over a deckchair. 'The government m

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