The UK support line for British Nationals in Afghanistan is +44 (0) 1908 516666.
If you are still in Afghanistan after the takeover by the Taliban in August 2021 and require consular assistance then contact the dedicated consular support number +44 (0) 1908 516666. The consular staff, who are based in the UK, will be able to assist you with practical support and advice on getting out of the country. When you phone you will be presented with some automated options, choose the option “Consular services for British nationals.”
The above number is run by the Foreign Office, and can also be used by relatives of British passport holders to seek advice and support.
British Nationals in Afghanistan Email – help@fco.gov.uk
British Nationals needing help in Afghanistan can also request consular support using the email help@fco.org.uk