https://assets.publishing.service.gov.uk/media/65c641159c5b7f000c951c44/Prime_Minister_Rishi_Sunak_s_schedule_of_taxable_sources_of_income_and_gains_2022_23.pdf
The income element was £432k, on which £163k income tax was due, giving an effective income tax rate of around 38%, far higher than the average worker. The figures are skewed by looking at a capital
gains figure and including that in the “income” calculation. That capital gains tax rate is that which is available to everyone if they make a capital gain.
The capital gains tax situation has changed over the years. Yes, it’s lower than the higher and additional rate of income tax, but experience has shown that the UK had to remain competitive when compared with other countries’ tax rates, or all that happens is that people making large capital gains leave the country (sometimes temporarily) in order to avoid UK CGT altogether. It’s better to have 20% of something than 0%.
Even using the capital gains tax figure (which heavily skews the figures to suit certain agendas), he paid an effective rate of 23%. Take a teacher earning £42k. They pay an effective rate of tax of less than 20%, and that includes the NIC due. On top of that, they will be eligible for things like child benefit, reducing their effective rate of tax even further. So, your comment in part b) of your comment is incorrect.
He still paid over half a million pounds in tax in a single year. If we want to keep the highest rate tax payers in the UK (and we probably do, given that the top 1% pay almost 30% of total income tax receipts), we have to remain competitive with the rest of the world. We cannot expect the top few percent to keep shouldering more of the burden. There comes a point where they say “enough is enough”.