Starring Simon Callow, Mark Gatiss and Tasmin Greig, the special has been adapted from the novel The Ghosts by Antonia Barber and the 1972 film of the same name.

London teenagers Jamie (Jason Rennie) and Lucy Allen (Tsion Habte) are in for a Christmas adventure when they meet a mysterious old man called Mr Blunden (Simon Callow). 

Blunden offers the kids’ mum an opportunity to become a caretaker of a ruined country house that is supposedly haunted. 

While exploring the overgrown grounds, Jamie and Lucy meet what appears to be a pair of ghost children called Sara (India Fowler) and Georgie Latimer (Xavier Wilkins).

However, they aren’t ghosts. The pair have travelled forwards in time to seek help due to their fear they are about to be murdered by the evil Mr and Mrs Wickens, played by Mark Gatiss and Tasmin Greig. 

Mr Blunden seems to be the key to solving it all and joins Jamie and Lucy in travelling back to 1821 to save Sara and Georgie.

The Amazing Mr Blunden will air on Christmas Eve at 7pm on Sky Max and NOW.