Around 77,000 people are to be contacted by the Financial Services Authority (FSA) to let them know they are being targeted by financial conmen.
The regulator has revealed that it is getting in touch with 76,732 consumers who it believes have being pinpointed by fraudsters trying to trick them out of their money.
Their names appeared on a number of lists recovered from companies that the FSA believes were fraudulently selling investments in land or worthless, sometimes non-existent, shares.
Combined into one list, this is the largest number of target victims that the FSA has ever contacted in one go.
Letters from the regulator will be arriving on people's doormats from today.
The first 10,000 letters will arrive today and a further 10,000 letters will be sent each week. The first 5,000 emails will be sent on 30th April, with a further 5,000 each week.
Most of the list contains the names and addresses of the targets. However, as 19,101 cases only email addresses are listed, the FSA will be sending these people an email warning.
"If you get a letter or email from the FSA over the next five or six weeks, please read it – it could you save you tens of thousands of pounds," Jonathan Phelan, the FSA's head of unauthorised business, said.
"If you have already been contacted by a firm offering you a 'once in a lifetime' investment opportunity or have already invested, then tell us.
"The information you have could help us catch criminals and shut down their scams."
The FSA has a team ready to answer questions about the letter and investment scams generally who can be contacted on 0845 155 6355.
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