Sir, Graeme Lamb says (Mar 10) that the Colossus computer helped to shorten the Second World War by about two years. I am less certain. Just over three months after the end of the war in Europe, two atomic bombs were detonated over Japan to conclude the Far East conflict. I am sure that if Germany had still been resisting the Allies in August 1945, an atomic device would most certainly have been deployed somewhere within Nazi-held territory, possibly on Berlin itself.
David Arnold
Lewes, E Sussex