Birds of a Feather - Season 6 Episode 13 -

With Sharon ignoring Tracey's advice to curb her spending and ending up skint, Marcus stopping Dorien's allowance and the swimming pool business being less than brisk in winter, the girls turn to selling double-glazing. Dorien reels in Concorde pilot Duncan as their first customer but when he and his sister appear to be fraudsters she takes drastic action to get the money.