Good news -- keep an eye on the register -- if (!) they get their copy of the certificate the IVA should show as completed until such time as it disappears within the next three months. I woukld also sugesta search on your proprty title at Land Registry in a few months to make sure the caution has been lifted ( it is becoming more common of late for this to be overlooked).
Any problems regarding the IVA with any former creditor should still be dealt with by your IP.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014