If you live in Switzerland or are a tourist then you will find the British Embassy in Switzerland in the city of Berne. The Embassy will be able to assist you with a registering a British national born overseas and also with other consular services such as a notary public. Like all Embassies you should always send them an email or call them before you visit them to ensure that they are open.
British Embassy Berne
Monday to Friday, 9:00 to 12:30 and 13:30 to 16:30
Monday to Friday, 9:00am to 12:00pm