Hi,
You will need to review the guidance on residence and take the statutory residence tests at RDR3:
RDR3 Statutory Residence Test
The days spent in the UK on holiday, will count when calculating your days in the UK. This test will determine your residence status. You will then need to look at section 6 in relation to split year. If the split year applies to you, it will commence on the day you arrive in the UK. Split year treatment can only be claimed in a Self Assessment tax return.
Thank you.