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That speed is the same as that quoted for the Hurricane Mk 1 equipped with armour plating and carrying full fuel and weapon load.
One must also remember that Gloster was committed in respect of Gauntlets and Gladiators in the UK and Middle East and for Sea Gladiators for the FAA. It was, in fact, a Gauntlet of No 32 Sqn which carried out the first ever intercept controlled by ground radar in November 1937.