The return of the experiment to see whether science can help people fall in love. The first two couples marry at first sight. While an unexpected surprise transforms one groom's big day, will another groom's impromptu musical outburst be a major turn-off for his bride?

Another pair of singles walk down the aisle, but could a frosty first impression leave one bride out in the cold on her wedding night? And as the honeymoons continue, one couple's romance goes from strength to strength.