Terrorism experts said that the South London shooting was an unavoidable use of lethal force, the first result of new rules of engagement given to the security forces to deal with the threat of suicide bombers: shoot for the head, not for the body, in case you detonate explosives on the suspect's body. If officers thought the man was carrying explosives, they had no choice.

Mr Winner, chairman of the Police Memorial Trust, went further than that. He told Times Online: "I think the police shooting the terrorist was absolutely right.

"Our whole approach to terrorism is absurd. We need new laws to detain people without trial - we are at war. We are playing cricket and they're playing mass murder. Police powers should be massively increased, as well as police numbers."