On the quick-paced nature of the episode, cast member quipped, 'Characters come through the door, put on a pair of skates and then, they are danced off.' The show's production team were dressed in so that if they were caught on camera, they would look like a background character. Stevenson said that 'One' uses an alternative method as 'everything is in the moment', which increases the pace of filming and therefore, the episode. She explained that while the audience only sees her character Connie walking down a corridor, she is actually walking towards 40 members of the production team, including a camera operator, who are walking backward. Unwin and Sen felt privileged to be involved in 'One' Sen called the episode a 'once-in-a-lifetime opportunity' and 'an amazing bit of film-making'. Hossington and Simon Harper, Kent's successor as executive producer, were overjoyed by Unwin's return.
Directed the episode, while Erika Hossington served as the series producer and Oliver Kent acted as the executive producer for his final episode. Production External video 'A promotional trailer for the episode'A promotional trailer for the episode'A clip of Chloe and Diamond arriving at the EDConception and development 'One' is written by the show's co-creator, who has not written regularly for the serial since its. Nine additional guest characters were introduced for the episode, including: Sun-Mi, a Korean woman injured in the house fire, portrayed by Aewia Huillet, and her husband Andrew Sully, portrayed by arsonist Dougie Cox, portrayed by Sule Rimi, and his nephew Chrissie Cox, portrayed by Dajay Brown Dougie's partner, Di Hawkins, portrayed by former actress, father and daughter Jerry Kennedy and Candice-Marie Kennedy, portrayed by and Jenna Boyd respectively elderly patient Rose Thomas, portrayed by Pameli Benham and musician Anthony Cleaver, portrayed by Harry Lovell-Jones.