Also different employer expenses per employee, I don't know them off the top of my head but the UK tax levels are pretty high.
2.5 years in London to level up my skills and work in a few startups, then buggering back off to Australia for CoL that while still expensive is less than London and much better weather and similar salaries to London.
They pay like 13% national insurance.
The rest of the tax is paid by the employee. And the 45% rate is only on any earnings OVER £150k. So the money eart less than that is at lower rates.
Threshold is probably 100 + (personal allowance)*2 where that was 12.5ish last I looked.
Also some state support (childcare maybe?) evaporates at 100, which is fairly similar to another tax.