If we are specifying, ordering, buying and building for our own Air Force, WTO rules just don't have anything to do with it. If the government issues a specification for an aircraft, it may well be that it is necessary for the government to part fund the necessary R & D. The point isn't about our companies being in the supply chain for a foreign aircraft, the point is about being in total control of what kit we buy for our needs and not being reliant on foreign suppliers. Now we can all recite deplorable failures on the part of British companies when supplying stuff for us, not least BAe, but having control and not having big brother America decide if we can be trusted with their precious technology is important, that kind of thing goes right back to the Norden bombsight.