It's been over six months since the new pound coins first went into circulation, which means that time is running out for the old counterfeiter-friendly versions you might have lying down the back of the sofa. You've only got another two weeks before you stop being able to spend them.
15th October is the last day you'll be able to take your old pound coins to the shops and swap them for whatever you can buy for a pound these days. A third of a Tesco meal deal, or a random piece of crap from Poundland. Businesses can also continue to give out the old coin until 15th October.
The Royal Mint estimates that there are 500 million of the old coins still in circulation, so it's encouraging people to spend or donate the coins before the 16th. After that, anyone who still has one will have to go to the bank and trade them in. Just make sure it's not one of the many, many fakes that are out there or you might get leave empty handed.
Make sure you don't have one of the rare coins first, though, because some of them are selling for a small fortune on eBay. The 2011 Edinburgh City and Cardiff City pound coins have been known top fetch up to £35 each.