What about December 27th, 28th, 29th, 30th? These are the “limbo days.” B&M largely runs normal Sunday hours (which are usually shorter, like 10am-4pm) or slightly reduced hours. Don’t fall for the trap of thinking “it’s still festive, so they’ll be open late.” They won’t.
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Here’s a pro tip: B&M’s website has a store finder that actually works. Use it. Type in your postcode, click the store, and it will show you exact Christmas hours. It is less painful than arguing with the lady in the car park who insists the shop closes at 8pm because “it did last year.”
Another funny thing: B&M sometimes closes early on Christmas Eve for “stock take.” That’s a polite lie. They close early because they want to go home, drink mulled wine, and laugh at the people banging on the door at 4:15pm holding a single onion.