One Monday afternoon, around three o'clock, pond supplies salesman Selwyn Robby arrives home towing the Toogood Aquatics exhibition caravan and orders his like-wife, Imogen 'Ginny' Dare, to get into the car. He's taking her on a little holiday, he says. To Wales. So begins their road trip west via ponds, pitstops, and blasts from Selwyn's past.