An early scene shows Barnabus’s parents, Fiona (Naomi Petersen) and David arguing and rubbing up each other the wrong way when Peggy and Bert are staying with them in the caravan.  Bert is full of increasingly unlikely stories, tedious for David who has heard them many times, but fresh for Fiona who as yet has not had her disbelief enacted.  Peggy listens patiently.