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 (Mathew Horne) to make amends with her estranged sister Nell (Katherine Parkinson). 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 b*****d she is today.