Since I have been a UK expat since 1996, and been investigated by HMRC, I can assure you that I am more than familiar with Gaines-Cooper case law.

I think we shall just have agree to disagree on this issue.

I've pulled the following together as a basis for financial calculations to ascertain a justification to move & cut my ties (as much as possible).

Have a look through and let me know your thoughts. Am I near to reality? Am I far out with my calculations?

The CHF1k rent seems low to me??? Someone living in Vaud should comment (I'm in GVA where that would only buy you good parking)

I've used that as an average for rents that I've seen for some based within a 10Km radius of Lausanne for 1 or 2 bed apartments. Maybe I'm wrong?

I do not know the area but CHF1K for flat looks low, I would double it - or even more if you are looking for furnished. You will also have to pay a deposit; say 3 months rent.
I do not know the area but car insurance also looks low; I would double that.

How will you pay for the car - I don't remember seeing that?

Does that include NK - nebenkosten - say 300CHF per month?

For Miete (which I assume to be rental), when I've been looking on some websites some apartments were coming in at the CHF1000, maybe I should increase this. As for NK (which I assume is heating & water) at CHF300 (approx £205) seems to be quite on the high side imho, again I may be naive to this but with not having lived in CH I wouldnt know. Hence the questions to help me clarify things.

Car & Home insurances I've based on CH comparison websites, again I maybe wrong.

As for furnishings and car, it is my intention to use a portion of my savings to purchase these in CH or bring over some basic furnishings (ship over) to get me started.

Reworked figures, NK, increased Rental, other bits & pieces

If you have a job here in Switzerland and go back home at least twice a month, you will be considered as an "international weekender" for Swiss tax purposes. This means that you will be able to deduct the living expense here in Switzerland (net monthly rent) and the travel expenses door to door (CH-UK-CH). There are special tax forms for claiming back the overpaid source tax.

You just need to keep all flight receipts etc. The Swiss tax office will also want to see proof that you have a domicile in the UK (rental agreement etc, a few utility bills). If you deregister in the UK and have the international weekender status here in Switzerland - at the end, you will pay very little tax

Need a great tax adviser, can you recommend one near Lausanne-Montreux... Thanks

Sorry, I don't know anybody there, I am from the German speaking part of CH...

This statement is true in case that he keeps UK tax residency and goes back to the UK AT LEAST every second weekend, which needs to be proved to the Swiss tax authorities.

Otherwise, if he goes back to the UK less frequently then he will be tax resident in Switzerland, with tax deducted at source. As he is earning more than 120k/year, which is the case here, he will then be subject to the so called "subsequent ordinary tax assessment", i.e. he will need to file a Swiss tax return that determines his final Swiss tax liability. The tax witheld from salary (at source) will be credited against this tax liability and he will get a refund (if source tax > assessed tax) or an additional bill (if source tax < assessed tax).

Just for clarifiation. Cheers.