RFIG21520 | Statutory Residence Test (SRT): Temporary non-residence: Meaning of residence and sole UK residence
From HM Revenue & Customs · Residence and FIG Regime Manual
In relation to whether an individual is temporarily non-resident, a residence period is either:
a full tax year
the overseas part of a split year
the UK part of a split year.
An individual will have sole UK residence for a residence period consisting of an entire year, if they are resident in the UK for that year, and there is no time in that year when they are Treaty non-resident.
An individual will have sole UK residence for a residence period consisting of part of a split year, if the residence period is the UK part of that year, and there is no time in that part of the year when they are Treaty non-resident.