On the topic of JSF vs F18/Typhoon, with airframe orders down to 50 (and realistically, more cost increases waiting to jump out at us and possibly further cuts to numbers?), I'm incredulous to the fact that the RAF are willing to sacrifice so much for an aircraft that is completely unproven and is showing some very worrying problems...and it still has the rump of its testing to fulfill. The only thing that, to me, makes this worse, is that we'll only be capable of deploying them in a laughably small number.
I agree that it will inevitably end up being a superb aircraft, but isn't the F35 going to be in production until 2035? If it was my reich, I wouldn't be getting it until it's a war-winning aircraft in practice rather than just on paper...chin off the F35 for the F18 & Typhoon and re-visit an F35 order next decade.
Keep the actual capabilities alive, in significant numbers and then replace them in significant numbers with working, proven, capabilities next decade.