In case my previous post wasn't clear, old banknotes are continually withdrawn from service and are automatically replenished with new ones. This happens when t

In case my previous post wasn't clear, old banknotes are continually withdrawn from service and are automatically replenished with new ones. This happens when they're deemed to scruffy to use (i.e. won't be recognised in automatic note/pay machines, etc.). Thus, every country has a deemed service life for notes which can range from some months to several years, moreover high denomination notes are less used so their estimated service life is longer. Given the change of monarch, the Elizabeth II/Turing note would be expected to remain in service and follow its normal life cycle (whatever the UK deems that to be) but come replenishment time it will automatically be replaced with a new Charles III note. Essentially, if the UK follows normal precedent then no more Elizabeth II/Turing £50s (with the possible exception of uncirculated stock) will enter service. That is, they'll soon become rare, especially so new uncirculated ones. Again, if the UK follows tradition then the 'components' of the new note will have likely been in the design phase for quite some time. I'd bet that various designs of the new King's bust already exist and are now awaiting the King's final approval. Thus, if I wanted a mint condition £50 or for that matter any note of current issue then I'd be on the immediate hunt right now. Coins are totally different, they remain in circulation indefinitely. The exception of course was when the currency changed with decimalisation, old coins no longer represented useable values of currency so countries such as NZ, UK and Australia were forced to remove all LSD coins and notes from circulation with the change of currency. Those of us who were around in the pre-decimal era were used to seeing coins with every† monarch on them back to Victorian times. It's why I've still got boxes of pennies and halfpennies with Victoria's bust on them. __ † Of course, Edward VIII excepted, although some uncirculated coins with his bust on them do exist (and they're now extremely value). The fact that they do is evidence for what I said above about the preparation of new currency being well in hand well before the actual event. ___ Edit: FYI: https://en.m.wikipedia.org/wiki/Edward_VIII_coins https://en.m.wikipedia.org/wiki/Edward_VIII_coins. https://www.cnbc.com/2020/01/17/rare-coin-featuring-king-edward-viii-sells-for-1point3-million.html https://www.cnbc.com/2020/01/17/rare-coin-featuring-king-edw... Note the value!