If your husband has a legal interest in the properties, then the fact then you should ask for a copy of his IVA proposals as soon as possible to see whether that interest was declared to his creditors.
If so, it is almost certain that there will be an equity release provision contained somewhere, which you would have had to agree to at the time he entered into his IVA. If you did not agree, or he did not tell you about this, it is arguable that his contract with creditors is voidable - but that could bring additional problems for you in that he may well then find himself bankrupt and a Trustee in almost certain to pursue that interest.
Getting copies of the documents your husband signed is a first point of call, and if you cannot afford a solicitor, the CAB to give quite good initial financial advice free of charge.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp