As Time Goes By - Season 6 Episode 6 The House Next Door

While spending an evening at home everyone is startled by noises coming from the empty house next door. Jean calls the police but, its just the ex owner getting some boxes he had left. The young police officer who shows up to investigate takes a liking to Sandy and asks her out. Jean gets news that Penny and Stephen are looking to buy the house next door. Alistair has a plan to buy the house so they don't have to deal with Penny and Stephen as neighbors.