Just a heads up.  I'm with Santander and I've had problems depositing at the Post Office the last 2 times.  Last month I tried and it kept declining, eventually I got some of it in but not all.  I rang the Branch and they said there shouldn't be an issue.  Anyway today I had the problem again and it wouldn't take any amount at all.

I rang Santander again and the initial person I spoke to couldn't see a big issue but transferred me to Fraud.  Apparently it turns out that in April the amounts you can deposit in the Post Office on most personal accounts changed and is £5000 over a 90 day period, something to do with new Visa/Mastercard rules, not individual bank rules.  Apparently it's ok to deposit into an ATM and Branch but not the Post Office.  She also said it's not something that is widely known by regular staff. 

Miamia, that is the best advice, and probably how I will have to move forward.

It is if you want to be under suspicion for money laundering, given that the use of numerous bank accounts to make individually unremarkable cash deposits that add up to a significant amount when taken together is one of the most obvious ways to do it

As long as you keep records and declare all the money to HMRC that has been deposited and pay tax I don't see why it should be an issue. I don't think Barclays would know how much you deposit to your Santander or Natwest account etc. Who and why would report her for money laundering? It's not a requirement to deposit and keep all your money in one bank.

I've been using several for many years, one I use to pay rent and bills, another one to pay my tax , third is for other general things and another is only for savings. This way I can keep track of my finances easier, anyway and feel safer in case I lost my card or phone.. Also all have different online banking facilities, one is easier to use to transfer money and use their app, the other is cheaper to transfer money abroad when I need that etc.

It is if you want to be under suspicion for money laundering, given that the use of numerous bank accounts to make individually unremarkable cash deposits that add up to a significant amount when taken together is one of the most obvious ways to do it

Also agree to keep several accounts after a dreadful experience with Lloyds some time ago, especially one for a savings cushion in case the main account gets frozen (hasn’t happened there, but we all heard of sex workers and just regular people experiencing this and it’s a nightmare).

I don't disagree with keeping several accounts and nor did my post - I have three current accounts and two savings accounts as well as ISAs, pension and so on. But I only pay my cash into one of them and the rest is done by transfer; I bank broadly the same amount every month, at the same branches and at roughly the same times of the week which also helps. It's changes in pattern that look odd, not consistancy.

Anyone who thinks that every move you make when it comes to banking isn't on record and accessible by various authorities must be absolutely barking mad - this is exactly how companies like the credit reference ones earn their money. It doesn't matter whether you (or I) are keeping everything totally legit or not in the event of investigation and the only thing affected is the result - it's still a monumental pain in the arse which is best avoided, and that means not doing things that will look deeply sus to anybody who takes an interest.

I have a nat west business account never have these problems as it’s a business that takes cash in registered as an entertainer. Could be a childrens entertainer could be an actor that’s none of their business. I think as long as you dont have adultwork credits going in and oniy fans money there is no way of knowing what kind of business your running. Also if we did eventually go cash free could get a card machine for the business.

Just had a warning from Monzo not to use my account for business. Asked me to open a business account or just use that one for personal.

I am a sole trader and recently opened a business account with hsbc
When clients pay me by transfer I give them a reference number so they don’t put meeting or something dumber. The account is easy to open online