Gosh Shaun - so many questions so little time.
Are you self employed and are you VAT registered. ?
Do you have a wiz of a wife/partner who has access to excel ?
You must keep a list of your customer activity as proof of income for the Inland Revenue. Sheets of paper are not acceptable.
You could either purchase a bespoke computer system like GEORGE or set up your own which me lovely, talented, beautiful....... wife did, and manages for me !!!
From a self assessment point of view you need to keep 2 types of accounts. Incomings and outgoings. How you set these up is up to you - personally we have geared then up to fit our business using microsoft excel. Our single income sheet also doubles as our debt collection list and also our scheduler as it shows 6 months of activity on one page. Who had a clean, what date, how much (to give you a total income ) and when it is next due for a clean. Its simple to set up (just takes a bit of time) and easy for me to manage whilst cleaning.
We then have a second excel sheet showing the outgoings by Invoices received or payment made (for petrol, equipment etc).
At the end of each day the wife updates the days work sheets and enters all my expenses for the day and WOW excel adds them all up for you. When this is done I take the updated sheets out as my collection sheets as they show the non-payers.
It therefore does not matter how you bank or how you pay as you must get a receipt for all expenses anyway. If you pay by debit/credit/transfere or BACS you must ensure you get a receipt to put through your books - statements are NOT accepted by the IR as they do not show the Vat. (I know cos they have been through my records). Dont forget to save any bank fee, charges and loan sheets from the bank as these need to be logged as expenditure too.
As a self employed person (if you are) you will be taxed on ALL your income anyway so why are you banking your cash ?
Finally (and thank goodness), list all your commercials on the incomings sheet irrespective of their payment method - once its on the sheet its sorted.
Let me know if you would like to see any examples - I'm more than happy to send them to you.