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I remember hearing that for shows where you have cash they have to use real cash due to counterfeiting laws. There was some Stephen Fry experiment thing where they saw what people would do if they found a bag of cash.
It gave me the idea of a heighst movie where an aging faded producer was struggling to finance their film and robs a TV show with the help of a talented, but under appreciated/estimated runner.
Lock-Stock with loveies set in Soho.
^^^^^ Really like the cash talk, I schlepped what the film crews used to get paid with.
Carrying larger amounts of cash and what happens then is fictionalized (set in free Tangiers) in Paul Bowles 'Let it come down'. And from the thief's perspective in Michael Mann and Meg Gardiners 'Heat2'.