You know the rules: you're out of the game if you hear Wham's 1984 festive lament "Last Christmas" at any time from the start of December until 2359 on Christmas Eve. Cover versions are safe, and there are many (thankfully the Crazy Frog version is rarely played).
Top tips: don't listen to the radio, unless it's R3 or R4. Do all your Christmas shopping on the Internet. Have food delivered. Stick to Wetherspoons pubs, assuming they still eschew piped music. Hide under the duvet until Christmas Day.
Post below when you're "out".