Thanks for the information guys, we are in a rented property through a housing association so shouldn't need to change properties while in the IVA, I have been doing quite a bit of research and a lot of people seem to be in a similar position to us in regards to the amount of debt owed (ours is just under £13,000 over 4/5 creditors), we don't have any equity and it is only my income that we are living off. I have spoken to some debt management companies and discussed budgets with them and what we can realistically afford.
The main thing my wife and I want to do is get out of the viscous circle we are in living off credit, although we have not missed any payments yet we are constantly having to juggle money around to cover bills, which isn't what we want, we want to be able to have money in the bank, to be able to treat our children and not have to worry about how we will afford necessities.
I have read about the windfall payments etc but we don't really have any extra money that will be coming in, maybe extra benefits if we have another child but that's it, my company doesn't offer overtime so I don't think we would need to worry about that.
Thanks for the information, you are all extremely helpful!