https://www.nnuimmigration.com/l1-visa-to-green-card/
(UK salaries are competitive enough nowadays that it's not really worth it for financial reasons, given the financial risks associated with the US. If you want to go for non-financial reasons, have at it.)
There’s a higher density of well-funded companies in the US who can afford to pay high salaries, so it’s easier to find a high salary, but if you find a well-funded company in the UK (of which there are many, and growing) then you can earn comparably high amounts.
If you have a £150k salary in the UK — which is easy enough at Google, Facebook etc. — you will have a very high standard of living, so much so, that moving to the US to earn $300k/year at the same company would have very little impact on quality of life.