The British Embassy in Asmara, Eritrea is very near to the Department of Immigration in Asmara. This Embassy operates everyday except on Fridays when it does not open after lunch time. The contact details for the embassy and a map and street address is listed below. Speak to the staff at the embassy or send them an email if you wish to obtain a British visa or wish immigrate to the UK.
They can offer you the best advice with regards to passports, marriages, immigration and migration.
British Embassy in Asmara, Eritrea
66-68 Mariam Ghimbi Street