A debtor trace starts from the data you already hold — last known address, date of birth, account history — and cross-references it against credit reference data, electoral and property records and open sources to establish a current residential address. The address is only reported once independent sources corroborate it, and on a No Find, No Fee basis you pay nothing where no confirmed match is produced.
Confirming the address is usually the gateway to the next procedural step, whether that is serving a statutory demand, enforcing a County Court Judgment or applying for an attachment of earnings order.