3/3. Love. Have scientists finally found the secrets of a long-lasting relationship? And if so, can they save couples on the brink of collapse? After 20 years of bickering, Lyn and Alan are contemplating a divorce, while Jay's recent affair has put his marriage to Hayley under intolerable pressure. Together with starry-eyed newlyweds Steve and Donna they undergo a battery of experiments testing their relationships. Armed with a new understanding of each other's biochemistry and psychology, Lyn and Alan, and Hayley and Jay, embark on a programme designed to rescue their marriages. Producer Jonah Weston ; Series producer Sara Woodford The Inside Story: page 64