Martin Lewis has informed those in receipt of the state pension of a method that could see them almost quadruple what they get back. The money-saving expert has made a name for himself over the years by providing tips on how to save money and enhance income in a variety of areas.

But the financial guru believes that his most recent piece of advice is the most important he has given in the last three years. He told This Morning: “This is about a deadline on the 5^th April for buying back old,…