Private investors who bought any structured products – not just those backed by the bankrupt US bank Lehman Brothers – may now be entitled to compensation for unsuitable advice, after a wide-ranging review by the Financial Services Authority (FSA).

This week, the UK regulator published the findings of two separate investigations: one into the advice given on Lehman-backed products and another into the “financial promotions” used to sell 56 other products. The FSA also said that it was ordering six financial adviser groups, responsible for more than half of all recent structured product sales, to review the advice they gave and provide redress to investors sold inappropriate investments.