direct to your inboxMoney Saving Expert Martin Lewis has issued a warning to people who have had a student loan after 100,000 people were accidentally placed on the wrong repayment plans.He says that many people have repaid more than they should have - but are able to get the money they've overpaid back. And in the vast majority of cases it's effectively free money, as getting the overpayments returned won't make the slightest difference to what you pay in the future reports the Mirror.