Specifically, the Fiance visa UK category enables a person who has ‘settled status’ in the UK to be their finance to join them in the UK. As a result, it is also known to be a prospective marriage visa. In case of the Spouse visa UK, it is very important for the spouse to be 18 years old or over. Check out this website for getting help for Fiance visa or Work visa in UK - https://www.wmimmigration.com/uk-spouse-visa/