A DAD has revealed how he slashed his son's car insurance by a whopping £450.
Marc says the cost-saving came after Martin Lewis shared a free trick.
The Money Saving Expert revealed in recent weeks how young drivers could cut insurance costs, after revealing they'd skyrocketed a massive 49%.
Martin said that means insurance for drivers aged 17-24 now averages a massive £2,000 a year.
He said this is because drivers under 25 are less experienced therefore insurance companies see there is a higher chance of them crashing - and the company having to payout.
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But, the expert revealed there are a number of ways to bring costs down - including adding family members as drivers of the car.
The Money Saving Expert said: "If you have a family member or friend who may drive the car and has a good driving record, adding them as a second driver can make you appear less risky and bring prices down.
"Try out different combinations - for example, add one parent to see the impact, remove them and add the other, then try both."
One dad, Marc, wrote in and said the tip worked for him - and saved him 30% on his son's bill.
He said: "I renewed my 18-year-old son's car insurance and saved a whopping £450 by adding my wife as a named driver.
"Massive thanks."
Lewis did warn to take care when it comes to adding parents - or others - as drivers.
He said it can be classed as fraud.
The Money Saving Expert wrote: "Never add a parent (or someone else) as a main driver if they aren't.
"This is 'fronting' and it's fraud. It'll be checked if you claim and the insurance will be invalid if you're caught.
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"You could even be prosecuted. Don't do it."
Lewis often gives motoring money-saving tips.
In November the expert told everyone auto-renewing their car insurance they face rising bills.
A confused fan emailed into the show and claimed: "Last year's price £315. This year's renewal £658.
"Comparison website checked and a new policy would be £380 Regularly auto-renewed. Never again."
Martin agreed, saying "yes, never again" - telling Brits to ensure they did not use auto-renew schemes.
He also said people could save £100s by making a simple change on their insurance.
The website's latest newsletter said: "Take a few minutes to check if you're overpaying.
"If you are, even if you're not near renewal, you may be able to lock in a price to forestall future increases for a year."
