Santa's tax satus

 A few year's back. Taxation magazine published this enquiry from a reader:

On a visit to the UK last year I picked up a copy of your magazine and wonder if readers can advise me. I am non-domiciled and non-resident (I think) in the UK – no permanent home here – but each year I work temporarily in the UK for a short period.

The work is unpaid, but I do receive benefits in kind; glasses of port, mince pies and the like. I am rather concerned that I have not declared these to HMRC in the past. Should I have done so and is there an annual tax liability to be paid on these gifts or benefits? And if there is, how is the tax calculated under self assessment?

The chosen pseudonym is "S. Claus".   

I wonder what advice one would give him for 2023?