The pilot of an aircraft who died alongside three passengers when it crashed into a field was an expert in chemical and biological weapons, it emerged today.

Dr Paul Norman, 52, of Salisbury, Wiltshire, was killed when the single-engine Cessna 206 he was piloting crashed in Devon on Sunday.

Dr Norman, was the chief scientist for chemical and biological defence at the Ministry of Defence's laboratory at Porton Down, Wiltshire.

He travelled the world lecturing on defending against the scourge of weapons of mass destruction, a friend and colleague said today.


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