Can anyone remember a TV program like this?

I remember one episode on about Christmas time in late 90's or early 2000's. I remember on of the characters going into a bookshop and finding a book. they then wish for a green monster which then appears and goes around the town terrorizing the people. The monster soon realizes he is lonely and leaves. we next see him on an ice rink and the song 'Marble Halls' is playing in the background. At the end, everyone comes together and buys him a red car.

I keep thinking it was called something like 'The Bookshop' or 'The Magic Book'.

Can anyone tell me what this was called as it is driving me crazy remembering it?