As I understand it only one Allied pilot flew that, and the standard practice was to have several unpowered flights by being towed to height and gliding down before a take-off by loading fuel and lighting the fire, and that's what he did. He was very valuable to risk and only did one powered flight, with good German language skills he was involved in interrogating very senior German officers. In his talk on flying it (on uTube) he mentions that the fuel would dissolve the pilot in 9 minutes if the tanks (in the cockpit!) were penetrated by gunfire. And he was RN not RAF.
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