Since 1 December, trucks have been arriving in different locations, each with special surprises inside.
The chocolate grotto was the first surprise revealed to passers-by in Liverpool on Tuesday (1 December). Inside the truck, the walls were clad with 1250 chocolate bars, a rug made from 6,150 individual Cadbury's Roses and a chocolate fireplace made from Crunchie bars and Double Deckers.
Claire Low, marketing manager at Cadbury owner Mondelèz International, said: "Santa’s Grotto is synonymous with the feeling of Christmas so we felt this was the perfect way to kick off our festive countdown. We wanted to create something that captured the excitement felt when opening the first door of your advent calendar, and the Cadbury Chocolate Grotto merges the wonderful themes of Santa and chocolate."
Cadbury is using its social media channels to let people know where its advent calendar is travelling to next. Followers can tweet using the hashtag #Cadvent or visit the brand's Facebook page.