IHTM04323 - Property of visiting forces: protection of domicile and residence
No period of duty spent by a qualifying person (IHTM04322) in the UK is to be regarded as a period of residence here for Inheritance Tax purposes. And you should not treat such periods as creating a change of a qualifying person’s domicile or residence (IHTM13000) for those purposes, IHTA84/S155 (2).