On the day of Roy and Hayley's wedding, Claire's mortified that Dev has dragged up her history of post-natal depression and finally tells the police that she left the kids with Sophie and Sian. Sally's livid as the officers question the girls and turns on Claire, demanding to know why she's accusing them. Later, as a treat that Becky has organised, Roy, Hayley and their wedding guests travel to the venue by steam train. During the journey, another row breaks out over the Aadi situation and Claire snaps, revealing to all that while Sophie was meant to be minding the kids, she was snogging Sian… Meanwhile, as Roy mans the footplate of the train, Hayley's hidden away in the last carriage. However, Mary's plotting and after her invite snub, she wants revenge. Putting a plan into action, Mary uncouples the rear carriage and by the time Hayley realises, it's too late - she, Becky and Fiz have been left stranded. Will they make it on time or has Mary derailed Hayley's dream wedding? Elsewhere, Natasha continues to lie to Nick and passes off Fiz's scan picture as her own, and Liz tries to negotiate peace at the Rovers.