The scene where Maj. Alex Friedkin (Jonathan Coy) makes his 'phenomenon' speech had to have several takes. The RAF personnel couldn't stop giggling at the way the word 'phenomenon' kept being repeated. In fact, during one take, they even chimed up with 'doo-doo-dee-doo-doo', in tribute to (and as a play on) the Muppets 'Mahna Mahna' song.
Real aircraft engineers from 111(F) Squadron, RAF Leuchars were used as unidentifiable extras to film the scenes in the Hardened Aircraft Shelter in the first episode. Other personnel from RAF Leuchars were also used in additional scenes.
The aircraft used were from 111(F) Squadron, Royal Air Force, based at RAF Leuchars near St Andrews in Fife, Scotland. The scenes in the first episode were actually filmed in the squadron's aircrew and aircraft hardened buildings.
As the BBC couldn't use real RAF squadron numbers in the production, 111(F) Squadron became 313 Squadron.
Members of Queens Colour Squadron Royal Air Regiment played extras in all episodes and provided military advice
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