Your husband will not be allowed to keep a car of that value in bankruptcy. Are there any family members who could help out with a lump sum to enable him to keep it?
I also think that you have misunderstood the creditors requirements re the equity in the IVA. He will not have to raise the £3,000 as well as the equity sum, and his IVA payments will cease once the new mortgage has been effected.
Read through the IVA modifications again carefully, and ask your IP to explain them to you again if you remain unsure.
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
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp