As long as it's not remitted to the UK, then Chanel Island income definitely not taxable for UK non Doms. Although after 7 years it will cost you £30k & £60k after 12 years, thus not useful to many.

1- it would be pretty unethical to pollute the planet with extra flights for people who are sufficiently wealthy and feel sufficiently entitled to travel to another country to simply get a vaccine shot a few weeks earlier

2- it's not gonna make any difference to you because the Swiss covid rules are based on how the country is doing, e.g. you wouldn't have been able to go to a restaurant regardless of your vaccine situation

3- the vaccinations in Switzerland are accelerating and the country will probably catch up with the UK in the short term, the canton of Geneva alone has more than 11% of its population vaccinated as of today, and this with two providers only, with more effective vaccines than the AZ.

4- I would still invite anyone to go have their shot somewhere else, that's less work for Switzerland.

Yes. My ex was trying to argue that my daughter was domiciled in the UK to have the court case there. The Swiss court and Reunite both agreed that she was domiciled here as she was living here for more than a year.
After searching a lot online, and also having a chat with HMRC about non-related tax issues, both of our domicile was in Switzerland for both legal and tax purposes.

UK definition of domicile for IHT is different, in this context domicile has nothing to do with where you are living, I am UK domiciled although I have not lived there since 1994.