£50 notes were popular for criminal transactions, and also they were widely forged; I don't know whether that's still the case, but I'm very reluctant to accept

£50 notes were popular for criminal transactions, and also they were widely forged; I don't know whether that's still the case, but I'm very reluctant to accept a £50 note. If a shopkeeper checks it and decides it's a forgery, they have to take it off me for nothing, and I'm down fifty nicker.