San Salvador in El Salvador where you will find the British Embassy for El Salvador. The Embassy can issue passports, with the the proper documentation it can also issue you with a British visa be it a tourist visa, family visa. You simply need to have all the correct documents for your visa to the UK.or
Below are the contact numbers for the British Embassy, the opening hours and also a map and address if you are going down to the Embassy. There is also an email address if you do not want to call.
British Embassy San Salvador
Switchboard +503 2511-5757
Monday to Thursday 7:30am to 4:30pm / Friday 7:30am to 11:30pm