Dorothy and Deborah have gone away on a sailing weekend. Tony is building a sauna in the garden shed - a ""shedna"" as he calls it. Gary and Tony meet Paula and Carol, who are staying at the house next door for the weekend. They invite the girls round for a barbecue. Tony makes a play for Paula, but discovers that she's a happily married mother. Gary is seduced by Carol. When Deborah and Dorothy come home, Tony talks Debs into trying out the ""shedna"" with him, but it blows up before they can use it! Gary obviously keeps quiet about his weekend activities with Carol.