Hi hrst and welcome to the forum
I assume that you mean if you were to propose an IVA to these creditors. Northern Rock are currently rejecting 90% of the proposals which are put in front of them, so if you owe them more that 25% of the overall debt, then I think you will find it difficult to find an IP to represent you. If the amount owed to them is lower, then you may stand a good chance, although MBNA do also reject a lot of proposals as well.
The key to a successful IVA is to show the creditors that the return offered is the very best that you can do given the circumstances. If this is proven, then in my experience most IVAs are accepted. The only few I have had rejected this year (approx 4) have been due to Northern Rock rejections.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk