Many claim to have received bad advice
Consumer education also targeted as an area for improvement
Salesmen selling investments in self-storage units have said they lied and forged documents to persuade investors to part with pensions worth £100m.
The Financial Conduct Authority (FCA) is considering raising the redress limit available to small business complainants from the Financial Ombudsman Service (FOS) above its current limit of £150,000.
Treasury Committee chairman John McFall MP is urging the FSA to examine claims some investors were mis-sold structured products by their bank.
Advisers have criticised suggestions that most endowment mortgages were mis-sold.
Nine in ten Britons with an endowment policy believe they were victims of mis-selling, according to research by Fairinvestment.co.uk.
The issue of mis-selling has again reared its ugly head after the FSA handed out its heaviest-ever fine for the sale of payment protection insurance (PPI).