We are in the opposite situation to most of the posters on here, as we worked for about 20 years in Switzerland and then retired back to the UK. We both receive the Swiss state pension for the number of years that we worked and DH also has a company pension. We pay no Swiss tax, all our income is assessed here and we pay UK tax on it. We decided to use an accountant to sort it out, because when we moved the situation was different, and we paid some tax in Switzerland which was then adjusted for in the UK.
With medical insurance, as said above everybody has to have medical insurance in Switzerland, and when we moved there it was relatively cheap and we insured ourselves and our sons to have private treatment paying a fairly small excess charge. By the time we left, the cost had risen so much that we, in company with most of the people we knew, had changed this to a general insurance with an excess of 1500SFr per year. The cost of insurance had almost quadrupled in that time.