I really can't see why they would start making a vaccine if its not really close to being approved, but then I think people are saying they are still in stage 3 trials.
They are in late-stage III trials and expect EUA in America sometime in May. I think you'll see a similar timeline in the UK They are doing "at risk" manufacturing with government financial support.
Pfizer, Moderna, and J&J all manufactured ahead of approval with government investments. Otherwise, there would have been none available when the authorization was issued.