A change suggested by Martin Lewis helped a fan save more than 50% on her water bills (Picture: Ken McKay/ITV/Shutterstock)

A woman says she’s saving £450 on her annual household bills after making a simple change suggested by Martin Lewis.

Gloria wrote to the Money Saving Expert founder to say she took his advice about installing a water metre after her annual water bill came to an eye-watering £799.

After using the metre for six months, she received a bill and was shocked to find itwas significantly lower than before.

Writing in the letter, which was published in the latest Money Saving Expert newsletter, Gloria, said: ‘I’ve just had my half-yearly bill and, based on that estimate, our annual bill should be around the £350 mark [saving £449/year].

‘I’ve done absolutely nothing different as regards water consumption. Many thanks once again.’

With a water bill you only pay for what you use – without, the water company estimates your usage based on the size of your home.

Martin has previously said that a number of households could save money by having a water meter installed, but not everyone.

Water bills rose by more than 10% in some areas of the UK in April (Picture: Getty Images)

His ‘rule of thumb’ is that if you have the same or more bedrooms than people in your home it could be worth having one.

So, for example, you have a four-bedroom home but there are only two or three people living there.

But before making a decision, he recommends using the Consumer for Water’s water meter calculator, which asks you about your average usage, then tells you how much this might cost when using a meter.

Questions include how many people live in your home, how many baths and showers do you take, do you use a dishwasher and how often and what do you currently pay.

Water bills rose by more than 10% in some areas of the UK in April, with the average annual cost currently £448.

Yesterday we shared another handy Martin Lewis tip that could see shoppers bag themselves some bonus cash ahead of Christmas.

Tesco customers have the chance to earn the extra money as part of the Clubard Christmas Saver program.

However, time is running out to claim your cash – if you don’t claim it by the middle of this month you could miss out.

This scheme offers a 6% bonus on the amount you save – which will be given to you in the form of a voucher.

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She cut her annual water costs by more than half.