Floppityflop, the only way banks will identify real criminals from people using money as legal tender is making checks such as this.
If banks don't question where cash is coming from or going to, then they are failing in their duty to identify if it is being used for criminal activity.
It is not about checking that your builder tells the taxman that you paid him £8k in cash.It is checking that you are paying a builder £8k in cash and not investing in criminal activity with £8k cash.
There is no cust welfare or sales as such here, as there is no bank benefit here, it is about trying to spot and stop criminal activity funding
Yes, access to CASH will be restricted while validated, but you will have access to funds as it can be traced where it is being sent to or from, which cannot be done by cash, which is why these checks are in place.
I agree with othet posters who work in bank, staff at branch aren't being nosey or acting OTT, its with good reason, and with the grief we get from customers face to face, its certainly not for our own benefit to do this