Bob has a dilemma - he is dating 17 year old Lorna Perrin and gets on well with her middle-class parents. Next door to the Perrin's is a vile old man who wears braces and spits - he is staying there while the owner is in Canada. The problem for Bob is the "vile" old man is Terry's grandad and he has to choose sides - a class war breaks out between the two ...