Of course this is all utterly hypothetical you understand
let's just say a party owed money in a country in which they were no longer domicile. A debt collection agency had been engaged to call in said debt and had written to said party at a forwarding address. One year later another letter arrives saying; Contact us in 7 days or we will have to issue a warrant, take further action blah blah blah.
Now, should the hypothetical party get its tennants of this hypothetical forwarding address to send the letter back marked " not at this address" and that will be the end of it, or do you think this Debt Collection Agency will send the boys round to my mother, errr to the hypothetical forwarding address, and make her spill the beans that the hypothetical debtor (dh) is in Australia? Whaddya reckon? Hypothetically?