The Proceeds of Crime Act in the UK makes it a duty for banks to know where large deposits come from. You walk into a bank where you haven't been depositing lar

The Proceeds of Crime Act in the UK makes it a duty for banks to know where large deposits come from. You walk into a bank where you haven't been depositing large sums of cash on a regular basis, with a clear rationale for having it (e.g. pre-Covid coffee shops), and you will very likely be asked to demonstrate where it came from. If you can't you're likely to have to forfeit the cash.