Anyone who has parked a bicycle near Whitehall or Parliament Square will appreciate the efforts that are being made to protect us from this threat; the police will confiscate it on the grounds that it might be a pipe bomb in disguise.
It has worked. So far no one in Britain has been killed by such a device. But the achievement is global. I have appealed for evidence on various websites, on the Radio 4 Today Programme, and on the BBC World Service. On evidence so far received it appears that no one, anywhere, ever has been killed by such a device. Can one ask for more convincing justification? The inconvenience of thousands of cyclists seems a small price to pay.