I think one of the real advantages of the IVA procedure, is that your creditors have to make a decision on a particular day - ie the creditors meeting, and will have to say yes or no. The majority of the banks and main lenders either have specialist persons in their insolvency teams trained to review and vote upon IVA proposals, or they outsource this work to specialist accountancy or law firms.
In trying to make this offer yourself outside of a formal insolvency process, you may not be able to find a decision maker, could wait weeks for your letters to be answered and never get to a position where you have a deal agreed with all creditors.
My advice is to leave this to the professionals, in such way as you will not have to worrty that any of the creditors can change their mind or pursue you into the future. Personally, I find MBNA a very receptive creditor, but they do like you to keep them informed of your situation in the meantime.
Like Catallus, I also have some experience of MBNA liking settlements outside of IVA proceedings, and as long as your other creditors are not likely to be prejudiced by this action - I had one case recently where MBNA accepted a lower offer, so the other creditors gained some advantage, there ought to be no problem in neogiating separaretely, but follow the advice of your own IP who clearly has more detailed knowledge of your case.
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