At the Henley branch of Tesco, Sheila has been promoted to the dairy counter, but her bitter ex Simon is there. When Doreen from the Indian counter is appalled to see them touching, she has no choice but to tell Mr Carter. That’s when Sheila swaps the three green lines for the three blue lines. But Mr Carter has massive expansion plans to turn the whole of Henley into one enormous drive through supermarket. Can Simon persuade Sheila to come back and help them thwart his maniacal shceme?