Across all squadrons and all the war, the average life of a Lancaster was 22.75 sorties, but rather less for the front-line squadrons going to Germany three and four times a week in 1943 and '44, which was when W4964 was flying her 107 sorties, all with No 9 Squadron and all from RAF Bardney. The first was Stettin (Szczecin in modern Poland), and thereafter she went wherever 9 Squadron went, to Berlin, the Ruhr, and most of the big ops of the time such as Peenem nde and Hamburg. She was given a special character as J-Johnny Walker, 'still going strong' and on September 15 1944, skippered by Flight Lieutenant James Douglas Melrose, her Tallboy special bomb was the only one to hit the battleship Tirpitz.

During her career, well over two hundred airmen flew in J. None were killed while doing so, but ninety-six of them died in other aircraft. This is their story, and the story of one lucky Lancaster.