I have a cashplus business account, it works OK, sometimes transfers can take a while to go in depending on the time of day, so always bear that in mind.  I did have a second business account with them for a totally different business (I dealt with a large organisation selling items, I had  business plan, accountant, paper trails, invoices etc, however they didn't like the look of it and questioned me about it and subsequently closed it down)  they then looked at my original account, but seemed happy with that!  I did have the same issue with Tide, they did exactly the same to my second business (I had healthy figures going through, but they too didn't like the look of it even though it was totally legitimate and closed me down).

I use cashplus business account, been using it for about a year. Super easy to deposit. I've had no issues with transfers. Just beware they might ask about the money going in. They sent me a questionnaire to fill out, plus they also asked for evidence of the money being deposited, that might depend how much you expect to put into though.
 

I don't believe so and can't find anything on their app x

So basically they want a tax return statement.

Nope, they wanted receipts. I asked if tax statements would be acceptable but they refused. Receipt books are cheap enough on Amazon. Just ask your regulars to do them for your logs and you shouldn't have a problem x

Well I’ve paid 2 small amounts into my account and neither are showing. That have bad reviews on TrustPilot and I can’t get through to customer services.
I get a bad feeling so will be closing my account .

I signed up, couldn't log into the app, tried reset log in details but the app said it did not recognise the sort code and account number.

See my experience here
https://saafe.info/main/questions-and-answers/post-office-money-deposit-cap/msg437368/#msg437368