Lavion Rose.
Thank you for the pm by the way, most kind of you.
Not grace and favor. The pilot's name is Lyall Grace, hence Grace v Commissioners/HMRC etc.
It is perhaps interesting, in the full context of the case history, to note that in 2001 South Africa changed its income tax basis for residents from an arising basis to a world wide basis.
Please do not fall into the trap of confusing Domicile and Residence (Ordinary Residence) in Britain. The two are clean different things.