Which British movie had two schoolkids getting married?

The British movie you’re referring to is "Four Weddings and a Funeral." However, it features multiple weddings rather than specifically focusing on two schoolkids getting married. If you meant a different film, it could be "Love Actually," which includes a subplot about a young boy who has a crush and acts on his feelings, but it doesn't involve a formal marriage. Please clarify if you had a different title in mind!