Thanks to an EU directive, people needing to remortgage will have to undergo affordability checks if they try to switch lenders – meaning that a number of so-called mortgage prisoners will remain trapped.

The Mortgage Credit Directive could particularly hit people going into retirement, who took out interest-only deals and who have no means of repaying their debt unless they remortgage or downsize. It has been dubbed the mortgage time bomb.

The directive over-rules arrangements made in the UK by the Financial Conduct Authority.

When the Mortgage Market Review was introduced almost a year ago, the FCA said that “trapped” borrowers would not have to undergo the checks as long as they did not want to borrow more money and had a good payment history.

However, the FCA has now said that it is having to withdraw its arrangements “as they are not [Mortgage Credit Directive] compliant”.

Robert Sinclair, chief executive of the Association of Mortgage Intermediaries, said: “This is an issue where European legislation has made it worse for UK consumers – there is no doubt about that.”

The transitional arrangements were originally introduced because of fears of a ‘mortgage time bomb’, with a number of borrowers on interest-only loans and no means of paying them off unless they switched to a product that included capital repayment.