The two states established diplomatic relations in 1891. During the Second World War, Switzerland represented British interests in Germany, Japan, Italy, France, China and other countries. In 1960, Switzerland and the UK founded together with some other European states the European Free Trade Association (EFTA).
Relations between Switzerland and the British Isles date back to the early Middle Ages when British monks came to Switzerland as missionaries. Contacts between Switzerland and England took place from the 15th century in the form of Swiss mercenaries serving under the English flag. The Swiss mountains and lakes have always held a special fascination for many Britons. In 1863, a British travel agency carried out the first organised tour to Switzerland. This paved the way for tourism in Switzerland and at the same time provided an incentive for the construction of the railway network in Switzerland. British tourists still account for the third-largest group of foreign visitors to Switzerland today.
United Kingdom, Historical Dictionary of Switzerland (de, fr, it):
Diplomatic Documents of Switzerland, Dodis