Hi Grief and welcome to the forum
As one of the forum experts, I will try and give you some advice based on the very brief details you have posted.
Firstly you have £35k of equity in your property which would be available to creditors were you to enter into bankruptcy proceedings. Secondly you have an ability to fund contributions at £770 per month, repaying debts of £88,000. If you were to release the equity in your property and make contributions of £770 for five years in an IVA, you would almost have paid over enough money to repay the debts in full, so I question whether you need either an IVA or a DMP to be honest.
Why not consider effecting an equity release now and pay off some to each of your creditors on a pro-rata basis to the amounts they are owed. This would reduce your debts to £53,000, to which you could pay ongoing monthly contributions over a period of time. Obviously your disposable income would reduce as a result of the additional mortgage borrowings.
I do not feel that a Full and Final settlement IVA would work, unless your partner was prepared to raise some of his/her equity to offer to your creditors in lieu of your future monthly contributions. If not, then a contributions based IVA is a possibility, with either a front or back end equity release, and this would give a good return to your creditors. I would expect the IP fees to be between £6,000 and £8,000, so not quite sure how the £15,000 has been calculated - but then I do not have detailed knowledge of your case.
Hope this helps, and other experts may have differing views.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk