Neighbourhood Watch is the 23rd episode in the series.
The Close is crime free and Martin intends to keep it that way, by organising the local Neighbourhood Watch in his own typically officious way. As a result most of the 'arrests' made by his patrol turn out to be false alarms, including that of a man caught by Howard and Hilda who tells Martin he is a chief superintendent and who invites everybody to a ball at the Ritz by way of compensation. Of course he is a burglar out to rob the guests' empty houses. Fortunately Paul tumbles to the fact and, unlike Martin, actually prevents a real crime.