Catherine Tate's iconic character Nan hits the big screen as she goes on a wild road trip from London to Ireland with her grandson Jamie to make amends with her estranged sister Nell. Militant vegan arsonists, raucous rugby teams, all night raves and crazed cops on motorbikes all make for a proper day out. An origin story that mixes Nan's present with her past where we finally find out what's made her the cantankerous old bastard she is today.

A tortured but determined young woman, in the grip of the Catholic Church, searches furiously for the child she believes has been taken away from her, but meets confusion at every corner.