You may need a visa for Bhutan if you have a British passport
Visa options for Bhutan
Electronic visitor visa
Travelers need a visa to visit Bhutan for Business or Tourism. A Bhutan eVisa is the fastest and easiest way of obtaining a visa for Bhutan because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveler’s passport information, travelers will not be able to board their flight.