Got one of these? Get rid of it NOW!
In case you didn't know, today is the last day that the 'Elgar' £20 note can be used in shops. After today, banks and building societies may handle them at their discretion - if not, you might have to see if the Bank Of England will take it off your hands.
There is still believed to be £1.5 billion worth of these in circulation, so it might be worth checking your pockets and wallets for any right this minute.