It is unusual that you will have repaid in full with the IP fees on top. If however there is no equity at the end the IVA will cease and creditors will not have received all their money. Your calculations would be right.
Sorry it took so long, I've been on the forums for 2 day's now, my eyes look like the ones on my avatar, think its a touch of Forum-itus!
Thanks again Foggy and Michael, I appreciate the time you have given.