 Three of the airworthy Mosquitoes used in the film were TT35 models  (target tug versions of the B35 bomber). These were made to resemble  FB MkVI (fighter bomber) versions by painting over the clear perspex  nosecones and side windows and fitting dummy machine gun barrels.  The fourth airworthy Mosquito was a T3 model with a solid nose which  only required the fitting of dummy gun barrels.