You might be tempted to sneakily use an old £1 coin in a vending machine or at a car park. Don’t. Vending machines will spit that coin back at you faster than a cat rejecting a bath. Most shops won’t accept them either, because they legally don’t have to.
I tried this once at a corner shop. The cashier gave me a look that said, “I’ve seen your type before, coin-conspirator.” It was awkward. Save yourself the shame and just take them to the bank. Your dignity is worth a pound.
Banks that will still exchange old £1 coins, £20 & £50 notes
Quick Pro-Tip: Sort Them First
Before you go, separate the old round pound coins from the new 12-sided ones. The new ones are still legal tender, so you can actually spend those like a human being. Nobody wants to be the person who hands a cashier a mixed bag of old and new coins and watches their brain short-circuit.
Also, check for special editions. Some old £1 coins have rare designs—like the one with the Scottish thistle or the Welsh dragon. Those might be worth more than £1 to a collector. You could be sitting on a small fortune, or at least a fancy coffee. Google is your friend here.