BBC News wrote:
N-Power, Unilever and TalkTalk are among the many companies sponsoring a survey which has been delivered to a million households in the UK. They want you to fill in the questionnaire detailing your personal information and leave it on your doorstep, in an unsealed paper bag. But Watchdog has spoken to security experts who say it's gold dust to burglars and identity thieves
http://www.bbc.co.uk/watchdog/