 During Naomi's episode in series 3, stylist Kirstie Stanway began to differentiate between Emily and her twin sister Katie's hair and makeup to show that the twins are starting to "move along their own paths".Originally, an entire scene was supposed to be filmed with Naomi and Emily in the lake, but the water was so cold that the actors were unable to stay in the water, and Kathryn Prescott was taken to a standby ambulance with suspected hypothermia.Director Simon Massey choreographed Naomi and Emily's sex scene prior to filming so that, on the set, the actions would come instinctively to the actors and they would be able to complete the scene in a limited number of takes.