Nan, played by Catherine Tate, returns to the big screen as she embarks on a wild road trip from London to Ireland with her grandson Jamie in order to reconcile with her estranged sister Nell. Militant vegan arsonists, rowdy rugby teams, all-night raves, and frantic cops on motorcycles all contribute to a truly enjoyable day out. An genesis story that weaves together Nan's present and past, in which we discover what made her the cantankerous old bastard she is today.