Can the old pound coins still be exchanged for the new ones? Date today is 17/10/17?

I saw the other week that you can no longer use the old pound coins however they are still in use everywhere!! I sold an item and when she turned up and collected it out my house she gave me some of the old £1 coins. I didn't properly look at all the change until I closed the door and she left. Is there any... show more I saw the other week that you can no longer use the old pound coins however they are still in use everywhere!!
I sold an item and when she turned up and collected it out my house she gave me some of the old £1 coins. I didn't properly look at all the change until I closed the door and she left.
Is there any shops or any places I can exchange them for the new ones?
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