The FSA is writing to a number of firms who sold Keydata products as part of an investigation into how the investment products were sold.
The regulator is writing to Keydata distributors who sold the Keydata Secured Income Bond and the Keydata Defined Income Plan between July 2005 and June 2009.
The FSA would not reveal the number of advisers it has written to or the number of clients involved.
Advisers are being asked to provide client details, investment amounts and details surrounding the product sale.
An FSA spokeswoman says: “I can confirm we are writing to advisers as part of a supervisory assessment of how Keydata products were sold to UK customers.”
Money Marketing revealed in April that the Financial Services Compensation Scheme is pursuing a number of firms for recoveries for Keydata claims to recoup some of the compensation it has already paid out.
Norwich & Peterborough Building Society, the biggest distributor of Keydata products, was fined £1.4m by the FSA last month. N&P also agreed to pay £51m in investor compensation, of which £28m will be repaid to the FSCS.
AWD Chase de Vere, another Keydata distributor, has upheld at least eight complaints over the way it sold Keydata products.