Other main subcontractors included Boulton Paul Aircraft, Excelsior Motor Radiator Company, Bell Punch, Turner Manufacturing Company, and Charlesworth Bodies; as many of these firms had little or no experience producing aircraft, both quality and interchangeability of components were maintained by contractually enforced adherence to Gloster's original drawings.
Andre større underleverandører var Boulton Paul Aircraft, Excelsior Motor Radiator Company, Bell Punch, Turner Manufacturing Company, og Charlesworth Bodies; eftersom mange af disse firmaer havde ringe eller slet ingen erfaring med flyproduktion, blev firmaerne kontraktligt bundet til Glosters originale tegninger og produktionsmetoder, for at kunne garantere kvalitet og udskiftelighed af komponenterne.