 After the Trotters became millionaires, Del returns to their now deserted flat and remembers his mother telling him he couldn't have the day off school with a hangover because he was taking his 11-plus (Joan is heard saying this in a voiceover provided by an uncredited actress).When Cassandra and Rodney have their baby in "Sleepless in Peckham", they name her Joan.The character makes her first screen appearance in "Rock & Chips".