The Liver Birds sequence for series one also exists but in poor quality. The first series was stopped after four episodes because Polly James' hectic schedule—working every evening on "Anne of Green Gables" in the West End, then rehearsing all day for the TV show—was proving too much. By the time James was available again, Pauline Collins had moved to LWT's "Upstairs, Downstairs". The producer Sydney Lotterby remembered having worked with Nerys Hughes on "The Likely Lads" and, wrongly believing the Welsh actress was from Liverpool, asked her to read for a part in "The Liver Birds". (Neither actress really had a Liverpool
Polly (Doctor Who) created Ben and Polly in 1966. What happens to Polly after her return to Earth is not certain. The Doctor seems to think that Ben will become an Admiral and that Polly will look after Ben, but it is unclear if this is a prediction or simply wishing them well. In "The Sarah Jane Adventures" story "Death of the Doctor" (2010), Sarah Jane mentions that Polly is now working at an orphanage in India with Ben. On 23 July 2017, the first trailer for the 2017 Christmas special episode, "Twice Upon a Time", was shown during the 2017 San Diego