There have been many calls for Northern Rock to offer some kind of rescue package to borrowers who took out the company's Together loan, a 100% plus mortgage. John McFall, chairman of the Treasury Select Committee is the latest in a long line of supporters for the rescue plan.

The Together range of loans offered by Northern Rock were made up of a home loan of 95% of the property's value, and an additional unsecured loan of up to 30%, to a maximum of 30%.

However, borrowers whose loan terms are shortly coming to an end and are looking to remortgage their loan face charges of nearly 16% if they choose to move the secured loan to another lender. This is good news however for other lenders, advisers and secured loan leads companies are people shop around for the best deal available to them.

Northern Rock, which recently fell into Government ownership, is being called on by advisers, to be lenient with customers who have these types of loans. Falling house prices will means that some borrowers will actually find themselves in negative equity.

McFall said: "Customers took out mortgages in good faith. Last week I called on the bank to abolish these types of loans. Now that they have done so, I would hope that the company works along with [customers] so they don't find themselves in a tight spot."

This seems to be the general consensus, with David Hollingworth of L&C brokers saying: "Northern Rock appear to be discouraging mortgage business on the one hand, yet borrowers who then decide to switch face punitive rates. Coventry is one lender that has offered a maturation package for borrowers coming to the end of their 100 per cent-plus deals - it is common sense for Northern Rock to follow suit."

Northern Rock now charges 7.19% on a two-year fix on loans for 95% of the property's value, this is a step up from 5.75% charged a year ago. The company recently sent letters to its customers, in an unusual move, recommending customers look to other lenders for loans.

An example of the letter said: "You may wish to arrange a new mortgage deal to avoid paying more than you need to. To arrange a new mortgage deal, we suggest you contact an Independent Financial Advisor who may have access to a wide range of new deals available in the market."

Together customers will be given the option to leave the entire loan they first took, with Northern Rock when the fixed term expires, they will face a default interest rate of 7.58%. Another option borrowers will have to consider is moving their entire loan to a different lender, however as all the 125% mortgages were withdrawn from the market recently there is only limited choice.

As well as this concern, moving the unsecured loan to a cheaper provider on the market would see a large increase in monthly repayments as the loan would need to be repaid in a shorter term.

A Northern Rock spokesman said: "You may wish to arrange a new mortgage deal to avoid paying more than you need to. To arrange a new mortgage deal, we suggest you contact an Independent Financial Advisor who may have access to a wide range of new deals available in the market."

Katie Tucker, a Charcol.co.uk spokeswoman, said: "I don't see how not offering these borrowers a roll-off package equates to treating customers fairly. "

She added: "With house prices cooling, some borrowers who took out 100 per cent-plus mortgages are in danger of sliding into negative equity - when they come to remortgage, they will have a tough time finding another 100 per cent-plus loan."

"With affordable 95 per cent loan-to-value (LTV) mortgages also becoming less common, there are even fewer options. Mortgage lenders who previously offered these deals need to come up with an alternative for customers who took them out in good faith."