Hi Richy
I am afraid that this does look as if it was a case of mis-selling, and your first port of call ought to be with the IP to explain the advice that you were given. Was the fact that you had equity of £60k at the outset of the IVA disclosed to creditors? If so, I am amazed that they accepted the offer in the first place.
If the IP refuses to deal with the issue, you could make a complaint to his/her regulatory body, however you would need to be able to prove that you were not offered different options by the IP with regard to dealing with your debts - such as selling or re-mortgaging your property. Given the passage of time, this could be difficult to prove either way.
Ultimately, a group of individuals have recently formed "The IVA Council" and are said to be backed by a legal firm who is looking into cases of mis-selling. You may wish to look into this as well, although they have had some pretty rought press since they launched their service.
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