Some firms (including, I think, Payplan) would seek to claim that you have an equitable interest in the property and see it included in the IVA. Others, will not, however, as Michael has said, the creditors might add an extra year to account for this ---- the crux being that in one case the Nominee would introduce the property themselves and in the other they would leavre it and hoipe the creditors ignore it too.
Regarding credit scores -- your husband could be slightly affected by the joint bank account and it might, in any case, be wise for you to remove yourself from that one and open a basic account, like a co-op cashminder.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014