As Foggy states an IVA on your record may make obtaining a mortgage offer difficult, the land registry issue will arise further down the buying/remortgaging avenue
If you don't have any luck with them I believe you can apply directly to the land registry yourself and have it removed by presenting them with documented proof as to why it is no longer applicable.
You will need credit reports from a 3 companies to check there is not adverse entries registered on any of these. You will then need an independent broker who specialises in dealing with people who have been in an IVA.
Ryan Radford
IVA Mortgage Expert
Zebra Money Centre
IVA Mortgage advice needed? Looking at Right to Buy and completed IVA still on credit files ?