The stock market turmoil is forcing up the interest rates at which banks borrow to fund mortgages.

And that means the rates they charge customers are on the increase too.

Earlier this week, Abbey announced its mortgages were about to get more expensive, and other lenders – including Halifax - look set to follow.

So it’s no surprise to see Woolwich, the mortgage arm of Barclays Bank, promoting a new ten-year fixed-rate deal.

It’s hoping nervous borrowers will flock to fix their rate at 5.59 per cent for the next decade.

Andy Gray, Woolwich’s head of mortgages, says: “With many borrowers coming off cheap fixed-rate deals this autumn, and many people in the market worried about volatility in interest rates, this product offers long-term security.”

But this type of security comes at a cost.

Although, in the current market, 5.59 per cent may appear attractive – especially when the Bank of England’s own base lending rate stands at 5.75 per cent – that could well change in a year or two.

Most experts agree that before too long interest rates will fall, and someone tied in for ten years to a rate that’s no longer competitive will be badly out of pocket.

Sign up for a product like this and there’s no way out though – unless you want to pay a six per cent early repayment penalty.

For someone borrowing £150,000, that would be £9,000 down the drain…

And for most people, that’s far too much to pay – even for long-term security.