Doug (David Tennant) and Abi (Rosamund Pike) and their three children travel to the Scottish Highlands for Doug's father Gordie's (Billy Connolly) birthday party. It's soon clear that when it comes to keeping a secret under wraps from the rest of the family, their children are their biggest liability... From the creators of the hit BBC comedy series Outnumbered - WHAT WE DID ON OUR HOLIDAY is a heart-warming, uplifting comedy for all the family.