If you qualify for split year then you only report any foreign income for the UK part of the year.
You can find guidance here
Residence, Domicile and Remittance Basis Manual
If you do not qualify then you will need to report all your foreign income to the UK. You can find guidance here
Tax on foreign income
The guidance at RDRM12150 at www.gov.uk will help you work out if split year treatment applies.