Per OTL, the Gladiator II was just like the Mk.I, with another mark of Mercury installed. However - what if Gloster made the monoplane version of the Gladiator, still retaining the fixed U/C, by 1937/38? In service by late 1938.
Basically, the British take on Fokker D.XXI/Nakajima Ki-27/Mitsubishi A5M theme (but with better engine than the Japanese duo) - 280-290 mph fighter that uses technology of yesterday to quickly improve RAF & other friendly AFs inventory of relatively modern fighters for use both abroad and at home.