The IRA bomb that went off in the Grand Hotel, Brighton in the early hours of 12 October 1984 blew half the building to bits, killed five Tory high-ups, including an MP, and seriously injured 34 others. The security forces really should have sniffed it out before Margaret Thatcher and most of her Cabinet moved in. It had been set up, with a timer, several days in advance. As an assassination attempt directed against Thatcher, however, it failed, having been placed in the wrong room. ‘The cry went up: “Maggie’s safe!”’ Jonathan Aitken remembered afterwards. ‘Such was the relief that strangers shook hands, and clasped each other’s shoulders.’ (How ‘British’! No hugging or kissing!) It also failed as an act of terrorism. Terrorism is supposed to terrify. The Brighton bomb didn’t. If anything, it had the opposite effect.