Financial expert Martin Lewis has shared how he helped a woman to claim one of the biggest amounts of cash in his career.

The Money Saving Expert founder shared the story on Thursday.

He helped a grandmother reclaim over £82,000.

Having seen the financial pro’s television show, Jill, 77, realised she might have a claim.

The woman had married her husband Robin 20 years ago, but just two years later he died.

Jill said: “At the time Robin died I got a very basic state pension.”

She didn’t realise that she could claim her late husband’s pension until 12 years later.

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Other women have claimed around £5,000

So, she wrote to the pensions office and was surprised to find out she had been underpaid by a whopping £82,100.

Jill commented: “I just couldn't get it into my head, it was astounding.

“I think it'll be a good Christmas for the family, my grandchildren as well as my children.”

The Mirror reports that Jill is not alone in being owed money.

Martin noted: "This is hundreds of thousands of women who could be missing out on thousands of pounds on the state pension."

The reason behind the claims is that married women who hit state pension age before April 2016 should get at least 60% of their husband’s pension amount.

You can get the money backdated based on when your husband reached 65.

If they turned 65 after March 2008 then you can backdate it until then.

Martin said: “With £82,000 at stake, it's worth spending time on.”

Other women have claimed around £5,000

The Money Saving Expert also claims there’s a campaign by former pensions minister Steve Webb to get thousands of people up to £80.45 on their pension.

It applies to women who are divorced or widowed or whose husbands are 65 or over who hit pension age before April 2016.

People who have claimed on this have been given over five grand and seen their weekly amount upped.

The reason women are missing out is due to the old system.

It meant that married women paid less national insurance than their male partners.

The “married women’s stamp” as it was known.

But, they were also entitled to payouts worth 60% of what their husband got in retirement.

The issue is they had to claim it themselves and not wait to be given it.

Women over 80 can also get their payouts boosted if they pass a residency test.

If you’re getting less than £80 a week then you can get your pension raised and backdated to when you turned 80.

Martin added: “Get in touch with the Government pension service to see if you're missing out.”