The Telegraph reports that Vince Cable has left confidential information in bins outside his constituency office.
Seems that he just doesn't live in the real world. For years the public have been told to shred any confidential documents because of the problems of identity theft and most people that I know are doing so. Shredders are available quite cheaply now, but in any case he would probably be able to charge the cost of one to expenses.
One can only conclude that he is just plain stupid. and I hope that the Information Commissioner's Office finds that he has breached data protection laws and fines him appropriately as he will hardly be able to charge that to expenses!