Not quite true.
The Harrier jump jet came out in the late 60s and the Americans, said it was pointless. Not fast enough, but then spent the next 50 years, trying to build their own one. Then when they agreed to 'buy it', with conditions, they found that their pilots had major issues flying it and so once again, tried to dismiss it as a waste of time and money. So the brits, made what is basically, an auto-docking system. As you say, now they have the F35, which on the drawing board and for the funding, plus using 'our special relationship' to get to understand and use the technology. This was meant to be a Harrier plus. VTO with a really fast top speed, I am not sure how many decades work and how much funding the F35 has had put into it, but as you say. Now they have a number of different models, a fast runway required one and a very very expensive Harrier.