For basis of clarification, the office of British High Commission in Nigeria is located at Abuja while the office in Lagos is known as the Deputy British High Commission located in Victoria Island.
The contact address of the Deputy British High Commission is
Deputy British High Commission, Lagos
11 Walter Carrington Cresent,
Victoria Island, Lagos.
Telephone: (00234) (1) 2619531, 2619537, 2619541
Email: consular.lagos@fco.gov.uk
Office Hours: 8:30am to 3:30pm (Nigerian Time) Monday-Friday.