Hi
HMRC does not have an actual definition of what a home is, as the meaning of 'home' can vary according to context. The guidance notes for box 9 ask -
"If you had one or more homes overseas and you spent at least 30 days in any one of those homes during the 2023 to 2024 tax year, put ‘X’ in box 9. You must consider each overseas home separately."
RDRM13030 states -
"The vast majority of individuals will have only one place where they live and this will be their home. If an individual has more than 1 place to live then each of those places may be a home. In this situation, whether or not either place is a home will be determined by the facts"
RDRM13030 - Residence: The SRT: Annex A: The second automatic UK test and the context of a 'home'
You will have to determine if you have a place to live outside the UK and whether this place is a home.
Thank you