Why a single mark closes the file
An apostille is a slip that says a named official really did sign the paper below it. Countries inside the shared treaty agree to trust each other's slips, which spares everyone a chain of embassy stamps. Switzerland joined the Hague Convention in 1973, so a British paper marked here needs nothing added to it before a Swiss desk will read it.
What the British half looks like
One office covers every city in the country, it works entirely through the post, and there is no counter in Cardiff for this. It marks register copies, court copies and papers signed by people whose signatures it already holds. An apostille from United Kingdom to Switzerland therefore costs an envelope, a fee and a short wait.
The cost is fixed per paper rather than per bundle, so a job with a degree, a transcript and a police record in it carries three charges. Weigh up early which of them the Swiss reader has actually asked for. Marking a paper nobody wanted is the most common way people spend more than they needed to.
The Swiss half, canton by canton
Switzerland runs much of its public business at canton level, and that is what makes this route different from a single-capital one. The office that reads your file sits in Zurich, Bern, Geneva or Ticino, and it applies its own habits and its own language. There is no national desk that hands down one answer for all of them.
So the useful question is not what the country wants but what that canton wants. A residence application in Geneva and the same application in Zurich can differ in the version of the text, the order of the papers and the deadline. Ask the person who requested the file which canton it goes to before you spend anything.
Language, and when to do the words
Have the translation made once the mark is on. A version done earlier describes a bare sheet, while the reader is holding a stamped set, and a careful office will notice the difference. Translators generally reproduce the slip alongside the text so the two clearly belong together, and that is what a Swiss file should look like on arrival.