The foundation of any strong relationship is said to be trust, yet apparently the principle doesn’t quite extend to your finances.

According to research from Defender Note, more than two thirds (67 per cent) of UK adults keep their bank card PIN hidden from their partner.

Men appear to be more careful with the numbers, with just 31 per cent sharing their PIN with their other half, compared with 35 per cent of women.

Split by region, couples living in London are the least likely to share their PIN with each other, with just 30 per cent doing so, while those living in the East Midlands are most trusting (42 per cent).

Londoners are more trusting when it comes to the workplace however, with four per cent admitting they had told a colleague their PIN before – a higher proportion than any other UK region.

The study also found that 54 per cent of UK adults have never told anyone their PIN, only five per cent have trusted their friends with the information, while four per cent have trusted their siblings.

Worryingly, five per cent of people surveyed admitted to storing their PIN on their phone to help them remember it, while two per cent keep a note in their wallet or purse.

Men are three times as likely as women to use an anniversary to remember their PIN, while more women choose to keep the random digits allocated to them by their bank.

Morgan Rothwell, CEO of counter-fraud company Defender Note, said: “It’s a little surprising that so many couples don’t trust each other with their PIN, but people are right to be careful when it comes to sharing their personal information.

“Criminals continue to come up with new and covert ways of defrauding consumers and the less people that have access to your account the better.

“In the last year alone, there’s been 26 per cent rise in card fraud in the UK, with last year’s total bill reaching £755million.”

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Average price rises for drivers renewing their car insurance have doubled in the past year as shopping around hits a three-year high,  independent data Consumer Intelligence shows.

Its data – used by the Government’s Office of National Statistics to calculate official inflation statistics – shows average renewal quotes have increased £22 on average compared to an £11 increase last year.

The price rises – driven by Insurance Premium Tax rises and wider market movements – have boosted shopping around to a three-year high with up to 11 million drivers expected to move insurer this year.

Consumer Intelligence’s data shows around 40% of motorists will switch and it advises all motorists to shop around at renewal to try to secure a more competitive deal.

A spokesman for Consumer Intelligence said: “The message on rising car insurance premiums is really hitting home and drivers are making the sensible decision to look around for the best possible deal.

“We are seeing a real acceleration in shopping around and up to 11 million of the UK’s 27 million private car owners will move this year.

“Customers really should be shopping around  which is being made easier as insurers need to make it clear what last year’s premium was when they send renewals.”

Consumer Intelligence’s analysis shows average car insurance premiums have increased 13% in the past year to £683 with more than half of that rise coming in the past six months.

Average premiums for over-50s are up by 15.3% compared to 9.3% for the under-25s but older drivers still pay considerably less than younger drivers – the average premium for over-50s is £298 compared to £1,600 for the under-25s.

One way for younger drivers to limit price rises is to look for telematics policies – so-called black box technology – which rewards good driving.

Consumer Intelligence’s analysis which focuses on the most competitive quotes from insurers for age groups shows 48% of the best deals for under-25s are from insurers offering telematics policies compared with 33% in October 2013.

Insurance Premium Tax was increased in the Summer Budget from 6% to 9.5% and again in last month’s Budget to 10%

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