Note the publish date – 2010!
Worth bearing this in mind, but the old-style £20 note will be withdrawn from circulation on 30 June 2010. You can read more/see confirmation on the Bank Of England website.
Official Withdrawal Leaflet
It’s worth also noting that you won’t suddenly be left with a load of useless money, because banks and building societies will still exchange/cash them for you for some time after the withdrawal date. But it is at their discretion, so be careful – they don’t have a good track record on being helpful of late. The Bank Of England will always exchange them, though.
But from that withdrawal date, the notes cease to be legal tender , and you won’t be able to use them to buy anything in shops. That also applies to your pupils, so be careful not to take them in payment for lessons unless you want to risk your bank or building society being arsey over it. At some point, they will.
I’ve noticed a huge increase in the old-style notes coming my way as people try to get rid of them.