There are just days to go before Christmas, and a herd of reindeer are running amok in the London streets. Meanwhile, nine year-old Tom (newcomer Kit Connor) receives an early festive surprise – in the form of Santa Claus (Jim Broadbent) taking shelter in the garden shed!

Having crash-landed when testing out his new sleigh, Santa enlists Tom and his father Steve (Rafe Spall) to help him get home to Lapland. Having just been released from prison, all Steve wants is to spend time with his son again, but his plan is thwarted when Santa attempts to liberate his reindeers from Battersea Dogs Home and is thrown into prison himself.

It’s down to Tom and Steve to get Santa out of Lambeth Prison and save Christmas, as well as reconnect with each other, in this heart-warming and adventure-packed British Christmas film that also stars Warwick Davis, Stephen Graham and Jodie Whittaker.