1) The Labour government needs a win and have been pushing hard for this for a long time. It's a completely different opportunity to work with the esteemed Universal Creative than with some brand new first-timer independent company making a brand new no-name theme park. This project is going to go ahead unless an earthquake spontaneously hits.
2) We know as of today that the official full name will be Universal Studios Great Britain.
3) As part of the December 2023 rumours and leak spearheaded by Alicia Stella of Theme Park Stop, it was allegedly always in the plan to have a lot of indoor attractions to counter the weather. See the indoor Minions Land ported over from Beijing, the new Jaws attraction being an exclusively-indoor experience, and the star ride of the park (lest BTTF), Jurassic World Adventure, being an indoor dark ride. Even more indoor attractions in outdoor lands exist too. The UK is home to the world's third-largest theme park operator currently, Merlin Entertainments, who have been successfully operating 4 outdoor theme parks in the UK for the decades now.
4) There are only 2 coasters on show in this park. The 3rd one you see to the centre right is not actually a coaster but just theming on top of the indoor Minions Land ported over from Beijing.
5) The Harry Potter Studios Tour attraction in Watford has exclusive rights to Harry Potter themed entertainment experiences in the UK, so Universal can't put a Hogsmeade or Diagon Alley or Wizarding Paris land in the UK.
I know we've all been burnt before with the London Resort, but that project died *because* Universal was planning to come to the UK. I haven't seen any strong reasons to be sceptical of this project yet, so let's hold off on pessimism until we have good reason to be suspicious.
This is what Beijing's indoor Minions Land looks like with the fake coaster theming atop BTW:
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