If you engaged to a British citizen or a person settled in the UK and wish to join them to get married, you\\ll need to apply for a UK Fiancé Visa. This visa allows you to enter the UK for up to six months to marry your partner. apply for uk fiance visa, you must prove that your relationship is genuine, intend to marry within six months of your arrival, and meet the financial requirements to support yourselves without recourse to public funds.