These thigs varied. In some situations there is no reason to assume that all twins can fly on one engine. In the Far East in the hot/high conditions beaufighters could not fly on one engine if they had the standard rocket rails fitted (with or without rockets), however they could if they had zero length rails which were just entering service at the end of the war.
Most extreme example has to be the much maligned Nimrod, normal practice was all four engines to get to the patrol area quickly, then patrol on one engine.
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