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: Contents
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 - Residence: The SRT: Split year treatment: Case 4: Starting to have a home in the UK only
will help you work out if split year treatment applies.