That's not really true. The UK led the world in aerospace until the mid-50s. If the lead had been kept rather than squandered it would have provided a huge boost to the economy.
The UK could have owned the launch business, and also owned much of the satellite business. It would also have been the first country with ICBMs, which would have changed the balance of power significantly.
There was a serious failure of imagination in Whitehall. Or possibly serious pressure from Washington.
And it happened again and again - as with the cancelled TSR2 project, and more recently with the bizarre decision to buy the F35 for the UK's new carriers, which means they'll have no planes on them for a good 5-10 years.
It's also fair to say the Nazi engineers were even further ahead. By the end of WWII German aerospace was maybe ten years in front of everyone else, with not entirely unrealistic plans for ocean-crossing jets and ICBMs.
If Germany hadn't been run by a psychopath, German technology might be where the US is today.