Owing money.. Will the loomfor me if I gap it back home to the UK?

If you came back to the UK, then yes they would still look for you. If they have any personal details such as previous address in the UK, NI insurance number, any UK bank detials they can track you pretty easily. The UK does have does have certain agreements with other countries to where you can be brought to court for debts from other countries, so moving back to the UK won't be as easy as you wish it was. They will carry on looking for you and probabily will track you down at some point. If you do move back to the UK once you've settled and got a job, try and make contact with your debts in NZ and make a repayment plan with them, even for the smallest of amount, at least you'll be able to sleep a little easier without worrying who will eb knocking at teh door next!