<p>Since lenders were ordered to repay billions to consumers who signed up to unfair car finance deals, millions of people have been sent adverts exhorting them to claim compensation through claims managers or law firms. But now the Financial Conduct Authority is to investigate the industry amid concerns of sharp practice and misleading marketing. Paul Lewis asks if the regulator has acted quickly enough to root out the rogue operators.</p><p>And we hear from the serial switchers - those tempted by cash perks to change their bank accounts. Is it worth it?</p><p>Presenter: Paul Lewis Reporters: Jo Krasner and Felicity Hannah Researcher: Catherine Lund Editor: Rob Cave Senior news editor: Sara Wadeson</p>