Among members of the public who confronted London Bridge attacker Usman Khan were former prisoners attending a rehabilitation event at Fishmongers’ Hall, including a man convicted of killing a young woman.

James Ford, 42, was out on day release when he joined those who chased Khan out on to the street before he was pinned to the ground on Friday afternoon.

Ford was jailed for life with a minimum of 15 years in 2004 for the murder of Amanda Champion, who had a mental age of 15.

It is thought Ford rushed to the scene and tried to save the life of a female victim of Khan. Sources said his actions during the attack had probably saved lives.

But Ms Champion’s family expressed concern that Hall had been allowed on day release from prison without his victims’ relatives being informed in advance.