Right, here’s the straight dope: yes, the Underground runs on Boxing Day. But it runs with a hangover, a bit of attitude, and an earlier bedtime than your gran. It’s better than nothing, but it’s not your reliable Tuesday commute.
Plan ahead, check the app, and bring a good book (or a strong phone battery) for waiting. If you do that, you can conquer the sales, escape your relatives, or just enjoy a quiet 45-minute delay with a cup of overpriced station coffee. Merry Christmas, and may the trains be ever in your favour.