In order not to clog the current thread about the Gloster's fighter, and because it is that time of the year ( ), I'd start the thread about how the RAF's doctrine and procurement should've looked like in the time frame between 1934 and 1940. Fighters, bombers, trainers, transports, plus how to use them and how many to buy to cover the possible threats, all on the technology of the day (yes, changes in techy stuff were happening fast back then). Engines, guns, electronics - what to make and buy and use, what to avoid? Deployment on the Continent once the political decision is made? What to buy abroad, from components to whole aircraft? Cooperation between the friendly countries?