has issued an urgent warning to people paying back a student loan with more than a million Brits potentially owed a refund.

, the founder of MoneySavingExpert.com has assured people that claiming it back is "very easy" with those overpaying getting an average windfall of £280, as reported by .

It comes as figures put out by the Student Loans Company revealed more than a million former students paid too much because they have exceeded monthly, but not annual pay thresholds.

Appearing on ITV's The Martin Lewis Money Show Live, said Brits are losing our for various reasons including, including being on the wrong replacement plan.

"There are four ways you overpay [your student loan]," he told the show, adding: "The first and the biggest by a mile, over one million overpaid this way, you should only repay if you earn over the annual threshold.

"For example for Plan 2, which has the most number of people on it, 2012 to 2022 English starters, you've got to understand, if you earn less than that [£27,295] you shouldn't repay the student loan but because it's taken via the payroll your student loan is taken monthly.

He explained that a twelfth of that is £2,274 anually, "so if you earn more than that in a month, you're gonna have student loan contributions taken from you".

Lewis also offered advice for people with uneven income through the year.

"If you work for only nine months of the year or you have some months with big commission, where you're earning over that amount, you will have repaid in a month even though your earnings are under the threshold," he said, adding: "Therefore you are able to claim this money back, over a million people are in that position."

Anyone who thinks they may be in this situation is advised to visit the Student Loan Company website where they you can complete a form requesting money back.

People may also be losing funds unneccessarily due to being on the wrong repayment plan, or having money deducted from their salary even after they've finished paying off their student loan.

In some cases people are also paying their loan less than nine months after graduating, which they are not required to do.

If you're concerned any of these may apply to you, contact your employer make sure payslips include the correct information and you're eligible call the Student Loans Company to seek a refund.