Unexplained Laughter Lydia is unlucky in love and retreats to the Welsh countryside with her friend Betty. But the beautiful scenery holds its own humour and passion. Details Casts Posters Title Unexplained Laughter Release Date 1989-04-25 Runtime 01 Hours 23 Minutes Genres Drama TV Movie Production Companies BBC Production Countries United Kingdom Diana Rigg... Lydia... Elaine Paige... Betty... Joanna David... Elizabeth... Jon Finch... Finn... Robert Gwilym... Beuno... Cindy Holden... Angharad... Robert East... Wyn... Emlyn Price... Hywel... Patricia Kane... Lil... Howell Evans... Sid... Moir Leslie... April... Anna Linstrum... Angharad's Voice... Miriam Margolyes... Laughter (voice)... Original Size (500x750) Original Size (1000x1500)