Hello Martin
I have read a bit about what you want to do. This is my experience with starting a small, home food business in Switzerland. It's more of less identical to the laws in the UK. If you read the UK government documents pertaining to your product, or what you would like to do, you'll get a pretty good idea of what the Swiss will expect. It's not that difficult and not that expensive. I am not an expert but from what I know you need to clearly document what goes into your product, how you make it. Then request that samples be tested by your Kanton food and safety board. You will pay for the tests but it won't be expensive. Those folks selling Jams on the roadside, e.g. farmers have to go through hoops too. Special rules for selling at markets, roadside, from your home etc. But if English is easier for you I really suggest the UK info. Or the EU laws also in English. I have spent months reading them all and reading all the Swiss federal and Kanton documents. They are all more or less the same. Lots and lots of helpful UK websites written simply for people like you to get the answers they need. My 2 cents worth 😁
Hello again
https://www.food.gov.uk
written in simple language for everyone to understand
Good luck
😁👍