You currently owe NR 175k against a value of 185k which is approx. 94.6% Loan to Value (LTV).
NR early redemption charges (ERC) after 21 months will be approx: (I’m not sure what the ERC would have been on the product available 21 months ago, but I will assume it is not too different from recent products = 4% ERC on 5 year fixed) £5800 on the secured part. Which would take you to 181k against 185k = 98% LTV
You do not seem to have sufficient equity to pay off NR AND your additional creditors.
Even if the figures above were wrong and you were able to remortgage just to clear NR, the fact that you are on an IVA forum, tells me that you are possibly struggling to make payments, AND because you have defaults you will not achieve a prime product and the consequent saving in interest rates therefore to remortgage will not necessarily be in your best interest at this time.
I would hang on, and try to repair your credit rating best you can over the next twelve months - if you are able.
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