Hi Lara
It is not clear from your post whether you are in an IVA yet or not. If you are, I am amazed that these things are being picked up at this stage, rather than at the time your IVA was accepted. As part of usual procedures, an insolvency practitioner ought to obtain an independent property valuation, mortgage redemption statement and H M Land Registry search to identify any difficult title issues, and report accordingly.
If you are not yet in an IVA, then your proposal should reflect the fact that your property is subject to shared ownership, and only 50% is yours. Whilst the revaluation clause is common, it is in no way definite in all proposals, so I suggest you offer a few contribitions during a sixth year to compensate and thus address the equity position.
For your information, there are a few lenders who will now allow you to remortgage your portion of the property, giving you another option.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk