There is a British Embassy in Kabul Afghanistan for British expats and those Afghan nationals who wish to apply for a British Visa to visit the United Kingdom. The office hours have been listed below as well as the contact telephone numbers and a map. If in Kabul it should be very easy to find as most of the Embassies and Consulates in Afghanistan as located close to each other.
British Embassy in Kabul Afghanistan
Details: Opening hours: Sunday – Thursday 08:30 to 16:30