Barksdale Boy is correct with the pilot (Joe McCarthy) and the airframe was indeed T-Tommy that had arrived from Boscombe Down only that day. It was therefore not equipped with the 'Light Altimeter' and sundry other locally devised mods. It is therefore extremely fortunate that Tommy was needed by a crew assigned to attack the Sorpe dam were the Light Altimeter wasn't required; McCarthy estimated that Johnny released their UPKEEP from 30 ft. Tommy was required when McCarthy's Q-Queenie developed a coolant leak on start-up.