Coronation Steet spoiler in The Sun today reckons that Carla Connor's going to have a drink-drive Christmas storyline as a warning to festive boozers. The paper reckons that Carla will be pulled over after drinking champagne at the opening night of Nick Tilsley's new bar. She fails the test and is hauled down to the police station. She is then fast-tracked through the courts and has her licence taken away. Viewers will have seen Carla stay on the wagon after realising she was drinking too much and becoming an alcoholic.
This could explain why she gets cosy with Peter, perhaps?