Yes, but he/she must provide evidence of his/her Gambian nationality and proof of address in the United Kingdom or from the countries that this Mission is concurrently accredited to. Passports are not issued at this Mission, but only by The Gambia Immigration Department in Banjul, The Gambia.
No, all documents that require authentication by this Mission should have the the Ministry of Foreign Affairs stamp and signature in Banjul affixed to it.
No, all passports are renewed/extended by The Gambia Immigration Department in Banjul. Passports extensions are not allowed due to International Aviation Regulations.
No, however he/she is required to extend after 28 days upon arrival in The Gambia. This can be done at the Immigration Department Headquarters in Banjul.