A young man starts a journey from a dusty village in Saudi Arabia He believes it will end with his death in faraway England For honour, for glory, for victory If his mission succeeds, he will go to his god a martyr - and many innocents will die with him For David Banks, an armed protection officer charged with neutralising the growing menace to London's safety, his role is not as clear-cut as it once was The certainties which ruled his thinking are no longer black and white Banks has begun to realise that one man's terrorist is another man's freedom fighter