The Passport Office insisted it took security "extremely seriously" after it emerged that a passport, birth certificate and visa documents were sent to the wrong person.
The documents, intended for a Pakistani man living in Lancashire, were sent to nursery worker Sarah Threlfall in Broughton, North Wales.
More top news
EU mobile roaming charges are being capped on Saturday. Here are some top tips to keep your bill down until they are scrapped completely.
Officials also looking at whether doctor was with the pop star on a plane that made an emergency landing less than a week before he died.
British cyclist Simon Yates has failed drug test but his team are blaming an "administrative error" over an asthma inhaler.