The Liver Birds and Series 1 starred Pauline Collins as Dawn and Polly James as Beryl Hennessey. In Series 2, Nerys Hughes debuted as Sandra Hutchinson, replacing Dawn for the rest of the programme's run. The Beryl-and-Sandra pairing is generally regarded as the programme's best period. Beryl was the more 'common' one, while Sandra was soft-spoken and more refined, due to the influence of her snobbish, overbearing mother (Mollie Sugden). Carla Lane drew on her own mother for the character – "Mrs Hutchinson, I think she was my mother. I'm sure she was my mother". Beryl's 'common' mother (the Hennesseys live in Bootle,
Polly (Doctor Who) Comic-Con, revealing the return of Polly alongside David Bradley as the First Doctor. She was portrayed by Lily Travers. In the spin-off short story "Mondas Passing" by Paul Grice (in the anthology "Short Trips") which takes place in 1986, it is revealed that Ben and Polly have gone their separate ways and married other people. By 1999, Polly is running a record company, has divorced and has an estranged son named Mikey, as told in the short story "That Time I Nearly Destroyed The World Whilst Looking For a Dress" by Joseph Lidster (in the Big Finish Productions anthology "").