Here’s your cheat sheet, summarized by a guy who once cried over a broken gravy boat:
Christmas Eve: Open 9am–4 or 5pm.
Christmas Day: Absolutely closed. If you think they’re open, please see a doctor.
Boxing Day: Open reduced hours (e.g., 10am–5pm). Expect madness.
New Year’s Eve: Open until 5 or 6pm.
New Year’s Day: Might be closed entirely. Check before you leave the house.
All other days: Normal-ish hours, but shorter Sundays.
Final thought: if you find yourself in a B&M on December 27th buying a deflated inflatable snowman and a pack of off-brand crackers, you are not alone. You are part of a proud British tradition of last-last-minute shopping. Just don’t ask the cashier if they’ve got any “back room stock” of those animated singing fish. They don’t. They never did. Happy holidays, you chaotic legends.