Martin Lewis has shared a clever trick which helps McDonald’s customers save money on their food order.

The Money Saving Expert explained the advice on This Morning.

The consumer rights campaigner said getting free food is easier than you might think.

All you need to do is fill in the McDonald’s survey on its website to get a cheap Big Mac.

News Shopper: Money saving expert Martin LewisMoney saving expert Martin Lewis

You can buy a 20p sweet curry dip to get your first receipt so you can save even more money.

Visit McDonald’s Food for Thoughts site to enter the code and fill in a survey about your last meal.

When you tell McDonald’s what you thought of the food you’ll be given a five digit code.

Jot this down on the same receipt as your original order and it will become your voucher.

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When you claim your discounted Big Mac, you’ll get another code to buy another cheap meal and the cycle continues.

As a meal, the duo usually costs £4.79, so you can save £2.80 and get it for more than half the price with the rewards offer.

“You’ll never pay the £4 for the Big Mac and fries,” Martin said.

You can also swap the Big Mac for a Veggie Deluxe or Filet-o-Fish and replace the chips with a side salad.

Previously on This Morning, Martin issued a warning to shoppers who rely on paying by cash.

According to the Money Saving Expert, shops are legally allowed to refuse cash payment for items as long as they are not discriminating against the customer.

The issue was mentioned on the ITV show, where the discussion of legal tender was brought up.

Lewis responded to this saying: "No, they are not breaking any rules."

"You are allowed to take card only as long as it's not discriminatory for race or disability or something."

He went on to explain the actual definition of legal tender.

"Legal tender has a strict definition.

"It means if you have a court awarded debt against you if someone tries to settle and they're paying in the legal tender you cannot refuse it.

"And that's all it means."

Martin said notes and cash are a legal currency for spending purposes but in some parts of the country, the only legal tender is actually coins.

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