Hi everyone, thanks for the replies

Hyperdrive - we don't own a home, we rent so it's not equity related. I'm sure it was just because the offer in our proposal was low.
Paul - based on the fact that we wanted this over with in 5 years, especially because we will be renting a home for the forseeable future, and because our I&E would see us with no money for anything like christmas or birthdays etc it's just bills and IVA, the 5 year term and having the interest frozen (as that's all we've been paying off on our cards for quite some time) was the reason I picked an IVA. There is no reason why we couldn't have chosen bankcruptcy technically but I wanted to pay back some of my debts and not try to avoid doing so.
I just don't see the point in a 6 year IVA when the creditors would have got back a massive sum of money back with a 5 year agreement and although I'm not sure, I think it's because of the bonus issue. I also was told to refininace my car at the end of the HP so that I could pay the balloon payment at the end and this is why my monthly payments would go up for the last year, but I know nothing about refinancing and that's assuming Honda would even let us. If they won't then we'd be in a lot of trouble having no savings to pay this balloon payment and we would have to give the car back, be in negative equity with it and owe them money plus not be able to get to work! So this is another issue that is bothering me but that's another story!
If any IP's can tell me where I stand regarding renegotiating the length of the IVA so soon after the meeting that would be great. We will be offering a lot more than the final figure specified in the proposal and I feel that our offer may not have been represented in the best way.
I know it's taken me a week to go through all the figures and realise this but due to not having the paperwork yet, my terrible tooth pain issues and being at work I just haven't had a clear enough mind. Is it even possible for them to renegotiate my proposal or am I now stuck in an IVA i'm not happy with due to what seems like a small error?