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Delia Smith and Heston Blumenthal feature in their own Harry Potter-inspired "school of Christmas magic" in the Christmas campaign for Waitrose.

The 90-second TV ad, the first work by Bartle Bogle Hegarty for the brand since winning the business, first aired last Saturday during The X Factor.

Smith prepares her original classic Christmas cake before the camera moves to Blumenthal, who shows off his mince pies with pine-scented sugar.

At the end of the spot, viewers are invited to interact with an augmented reality experience. Using a blippar app, users get further access to Smith and Blumenthal content.  

The ad was created by Kimberley Gill and Mareka Carter, and directed by Siri Bunford through Knucklehead. Post-production was by The Mill.