If you qualify for split year then you only report any foreign income for the UK part of the year RDRM12000 - Residence: The SRT: Split year treatment
If you do not qualify then you will need to report all your foreign income to the UK Tax on foreign income
The guidance at RDRM12150
, uk will help you work out if split year treatment applies.
As such, you can apportion the bonus payment for the income prior to arrival.
As you will only be reporting the UK part of your income, you may want to claim relief in Hong Kong for any of the UK tax paid. you cannot claim foreign tax credit relief as you are not resident for 22/23