Along with all of us I've had a few non-payers, time-wasters, not-this-month punters etc etc....
Is there any way that Cleanitup.co.uk can have a register of crap customers...name and address and "offence".
Perhaps the register can be by area (nationwide) so when you get a new customer you can check the register to see if they've a bad history.....a bit like credit rating.
EDIT....what do you reckon?....is it possible/legal?