You are not automatically entitled to split year treatment. You need to decide this by taking the Statutory Residence Test that you can see here:
RDR3 Statutory Residence Test
As you have foreign interest you fall within Self Assessment criteria and must complete a Self Assessment tax return. The deadline for receipt of this return was 31 January 2023 if submitting online and 31 October 2022 if by paper.
You will be charged late filing penalties but you will have the option to appeal against these using form SA370.
Self Assessment: appeal against penalties for late filing and late payment