The more you tax people who are already contributing a lot, the more you push them towards emigration - and therefore losing all their future contributions.
Life is pretty shit in the UK already - cities are lawless, getting a GP/hospital appointment is exceptionally hard, you can’t get a driving test for love nor money. Schools are overcrowded and ill disciplined. You want to go to uni? Cough up £10k per year for fees. And good luck with job hunting after that (perhaps go abroad for a job!).
Students in Denmark can go to uni for free. Norway has low unemployment and low homeless numbers. Iceland has extremely low crime rates. Australia offers a different life. Dubai is attracting people.
The UK is in decline. We are losing all sorts of good people from doctors to tradespeople to teachers. This is disastrous.
I find change quite difficult. But I’m starting to consider emigrating. The grass isn’t usually greener, but the state of the UK means that actually, if you pick the right place, it just might be.