So you haven’t remortgaged since 2006? You must have been paying way over the odds for most of the duration of the mortgage, because rates fell very sharply in 2008 and remained very low after that.
How much equity do you have, what is the remainder of the mortgage and how many years do you have left?
I’m confused about them writing to you to say you have to alter payments…. The payment schedule for the loan and the mortgage should have been fixed, at least for the start of the mortgage
you need to firstly write to your lender and get copies of the annual statements for both loans, which will tell you how much the balances were, how much you had paid etc
If you have a financially-savvy friend or family member, you might want to ask them to help you go through all of those and see where things have gone wrong.
You can then work out why this loan has gone unpaid, and if it’s not your fault, try and have the default notice removed.
If you have got a default notice, there is an almost zero chance of you getting a mortgage at the moment.
You have basically shown the bank that you are unable to cope with your existing debt level, so there is no chance they will give you a bigger debt.
if you move and downsize, you might be able to get one but it will be from a sub-prime lender so will potentially end up costing you a lot more.
what is the desperate need for a bedroom at the moment? Can you have a temporary situation while you repair your finances?