Switzerland, located between France and Italy (in yellow) is not part of either the EU or the EEA, but it is a member country of the European single market, with which Swiss nationals have the same rights as any other citizen European to work and live in England. Likewise, foreigners from Iceland (to the northwest of the map, in pink), Liechtenstein (between Germany and Austria) and Norway (Northern Europe) have the same rights as the Swiss. You have all the information in: «Tips, documentation and requirements to travel to the UK«.
You have all the information in: "Tips, documentation and requirements to travel to the UK".