come from this site. among them is the bank of england's new £50 note, which enters circulation today. six million could be printed in a single day, each of which carry the signature of the bank's chief cashier. the first time you see your signature it's a very strange feeling. but actually, it's just such a massive privilege. is the £50 note still relevant today? they're used more often, i think, than people realise. a lot of tourist spending is dependent on banknotes, £50 banknotes, but also they're often used as a store of value. and i'm sure that's what many of these notes will be used for. it's quite heavy, and i'm holding a quarter of a million pounds in the bank of england's highest value notes. but while you might not get one of these in your pocket compared with a fiver, a ten or a 20, the whole collection has got something in common, because for the first time, they're all made of plastic, not paper. plastic, or polymer notes, last longer. so will we need so many of them? people ask that all the time. i think making polymer is more challenging, and it's different to paper because it lasts