This episode sees PE teacher Sam and NHS advisor Matt compete against facilities manager Eva and car salesman Nathan. During this one-of-a-kind wedding day, a pair of brothers brave new heights for their sister's wedding, a bride's dress is in peril at the hands of mischief maker Ben Hanlin, and the friends and family on both sides team up with singer Lemar for a surprise wedding performance.With celebrity wedding guests including Lemar, Westlife's Mark Feehily and celebrity chef Rustie Lee, as well as magician Ben Hanlin and resident daredevil, comedian Tom Allen.