Getting a UK Citizenship has several advantages and benefits. The Form AN is used to apply for UK Citizenship. The UK Immigration Centre helps you prepare for UK Citizenship Online. Fast & Easy Steps. Check your eligibility for FREE to become a UK Citizen today! Call Us @ (020) 3514 1471. Disclaimer: UKImmigrationCentre.co.uk is a private entity and is not affiliated or approved by any government agency. We are not a law firm and don’t provide attorney’s services.