Hmmmm .. maybe this wasn't all explained clearly enough at the start. As said above, you don't need to accept nrams extra year (what percentage of the debt is their's?) ... remember, with an equity question there is a possibility (however small) of another year in lieu of equity!
Another thing to bear in mind, regarding how hard PP played for you, is that they are funded in part by the creditors themselves -- on the other side of the coin PP have already put a lot of work into this proposal, so would rather see it accepted.
In BR you might (might!) lose the house, but it is in negative equity and potentially could be costing you money anyway if it in untenanted for any length of time over the next 6 years or so. So -- could you cut your losses there ?
There is a lot to think about before getting committed to the IVA -- if you are prepared to go BR if needed, call nram's bluff, refuse the amendment. They will either back down (unlikely) or the proposal won't go through.
I am afraid only you can decide which way is best for you, taking into account all of your circumstances -- but think hard before jumping either way.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014