A little aside for you. dingbat ---
The lead navigator in the film had lost one of his eyes as a result of a car accident when he was a QFI at RAF Cranwell - lost his pilot category, and became a nav. Sometimes the sightless eye would leak a little, and he would wear an eyepatch (not the nuclear issue!) to contain the offending fluid. During the filming of the scenes in Gibraltar, including the one where he and his pilot were de-briefing the groundcrew (the excellent Sqn WO, Mr Milner) over the engine fire incident, the eyepatch was worn - much to the delight of the director, Hugh Hudson. The film was duly completed, and all and sundry attended the pre-release viewing at MoD; whereupon DPR (RAF)'s civilian recruitment advisors blew an almighty fuse, claiming that the navigator's appearance would be detrimental to their cause. Plonkers!!
And so all repaired to an outbuilding on Honington airfield, where the crew were doused from a watering can to create the necessary sweat-effect, and the sequences were re-shot. Still, it got everyone (excluding the plonkers) another boozy nosh in Soho, courtesy of the producer. Happiness!