The interesting part for me was this:<p>> According to the NAO report, The Bank of England has estimated that 20-24% of UK notes in circulation are in use or being held for cash transactions, with a further 5% (£1-3.5bn) held by households in savings.<p>> “Little is known about the remainder (approximately £50 billion worth of notes)” said the report. Potential explanations include overseas holdings for transactions or savings and UK holdings of unreported domestic savings or for use in the shadow economy.<p>So over 70% of UK banknotes are just... missing? Apparently the UK's market for drugs is a bit under £10bn per year (a third of the entire EU, go us!) so it seems black market usage is unlikely to account for the entire £50bn.<p><a href="https://www.russellwebster.com/carolblack5/" rel="nofollow">https://www.russellwebster.com/carolblack5/</a>