So let's say that UK company produced about 200 2-engined fighters of modern appearance before September of 1939, and another 300-400 before the German offensive in West. Add nother 1000 before 1942. Performance of Hurricane/Fw 187/F5F, but with 50-150% more firepower than Hurricane. What impact can we see in the early days of ww2? Modifications for other duties? Feasible upgrades? Apropriate war theaters?