HMRC Approved schemes only from Share Save through EMI (the gold standard)

If you get RSU's in an American parent company your screwed its just income there's some calculations on the relevant redit r/UKPersonalFinance - basically its treated income and you also don't get the legal protections

It's actually even worse in the UK. If you get a grant in the UK, you still owe taxes when it vests, even if you've left the UK years ago.

as the site says "The UK tax treatment for RSUs is similar to how your salary is taxed."

The example shown on the site you quote has a 56.53% effective rate - don't forget you pay NI as well

As I said very poor I paid zero tax on my two share saves and my current EMI is at the 10% rate.

Update the 56.5% rate is after you put 20k into pension the actual rate is just under 70%