 This episode sees Tom hit the big 3-0. Tom s parents come round to wish him happy birthday and to unintentionally aggravate him. They tell him they ll be staying in a caravan and using his bathroom which he s not pleased with so he comes up with a cunning plan.... he asks Linda to come onto his father to scare him off but it backfires - Linda actually sleeps with him and it turns out his parents are swingers anyway!