You need to be very careful about offering a lump sum IVA in today's climate - where creditors are more likely to want you to pay five years worth of IVA contributions and then an equity release at the end.
In my experience, the days of lump sum offers from equity release in full and final settlement are long gone, and I cannot see why you would be advised that £21k is sufficient to offer, when you have equity which is almost equivalent to the amount that you owe.
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