Owe my employer money. Wrong address. ,

imme2000

Thanks for responding. Would that mean I’d be liable to pay the original debt + £200 in court costs? 

When I’ve looked, I think I may qualify for help with court costs due to being on less than £1000ish a month.

Can the company apply for an AOE without knowing where I currently live? 

Galloglass

Would that mean I’d be liable to pay the original debt + £200 in court costs? 

If you agree you owe the original debt, then a "with consent" application @ £100 (or less if you qualify for help) is the way to go. Whether the ex-employer wants you to pay the original debt + their court costs, I can't say until you talk to them.

If you don't agree you owe the original debt, then a "without consent" application @ £255 (or less if you qualify for help) is the way to go. Then the ex-employer will have to show the evidence they would have shown if the claim had not gone to the wrong address. A hearing date would be set

At that hearing, if you win, you won't have to repay the ex-employer and you may get your £255 (or whatever you paid). If you lose, you would have to pay the total of the CCJ (the original debt + their court costs,) plus their costs again and you've lost the £255. 

The AOE is governed by this legislation. So they need to know where you live and work
https://www.justice.gov.uk/courts/procedure-rules/civil/rules/art-89-attachment-of-earnings

1) An attachment of earnings order must contain such of the following information about the debtor as is known to the court—

(a) the debtor’s full name and address;

(b) the debtor’s place of work; and

(c) the nature of the debtor’s work and the debtor’s works number, if any,
and that information will be the prescribed particulars for the purposes of section 6(3) of the 1971 Act.