In this episode Dora Bryan and Anne Reid play mother and daughter for the second time, both times for Victoria Wood and despite Bryan being only 12 years older than Reid. The first time was in an episode of Wood's Victoria Wood: As Seen on TV (1985) back in 1986.
Thora Hird amd Dora Bryan played sisters in Last Of The Summer Wine
This was actually the first episode of dinnerladies to be filmed although it was never intended to be broadcast as the first episode. - Source: The authorised biography of Victoria Wood by Jasper Rees.