Bailiffs
What a nasty career choice. These people "buy" the debt from the people you owe money and if they get the money they keep it. Did I mention that I don't bother with parking tax, Ooops I meant fines. If they know where you live, that can be a problem. Don’t open the front door; speak to them through a window. Tell them that you have moved and show them some proof. A utility bill in someone else’s name is good, but they may do some checks and come back.
Court bailiffs have more information and don’t give up. If they know where you live that is.
Both types of bailiff are totally flummoxed by private PO boxes. They turn up at the office and realize they have wasted their time. If it is a parking fine you owe they will know your vehicle registration but the police don’t tell them where you park. Have no sympathy for these people. They have made their career choice they deserve a hard time.
You may get some kind of letter telling you that your credit rating will be affected. Well banks aren’t lending money to anybody so who cares?
A short stint in prison no longer wipes you of your debt to the courts.