Late payments are the bane of the independent business owner or the self-employed individual. It's not unknown for me to be asking the bank for extra credit when my accounts show I'm actually owed £10K or more.
It's embarrassing, though, that the Department of Trade and Industry - you know, the business voice in Whitehall - has been caught paying very late indeed by The Times and no doubt others.
If you're in difficulties because of late payments, this website from the Better Practice Campaign has a lot of practical help to offer.