Personal and financial data is being traded on a "huge scale" - and sometimes illegally - according to an investigation by Which?
Undercover researchers from the consumer group contacted 14 companies that sell data. They managed to access personal information about half a million people over the age of 50, including details about their salary and pensions. In some cases the data was on sale for as little as 4p an item. Such information can be instrumental in helping scammers who con people out of their pension savings, or persuade them to move money from their bank accounts.