RFIG21040 | Statutory Residence Test (SRT): Split year treatment: Case 1 - Starting full-time work overseas
From HM Revenue & Customs · Residence and FIG Regime Manual
An individual may meet the criteria for split year treatment for a tax year in which they begin full-time work overseas. They must:
be UK resident for the tax year in question
be UK resident for the previous tax year (whether or not this was also a split year)
be non-UK resident in the following tax year, because they meet the third automatic overseas test (refer to RFIG20140) (even if they meet the first automatic overseas test in that following year)
satisfy the overseas work criteria during a relevant period