Profit and loss isn’t necessarily about how much you have in the bank, it’s about what you’ve charged customers and what suppliers have charged you. Your balance sheet will however show you your bank balances as the cash would be an asset (or lack of would be a liability).
There was actually a post yesterday about this which you may wish to take a look at:
http://community.quickfile.co.uk/t/sole-trader-drawings-on-p-l/12072?u=qfsupport