If the firm cant get the paperwork right for you on day one then I would consider not using this form and getting some opinions from other firms too.
It seem like they are trying to do the "hard sell" on you and get you on their books, again not something I feel particularly fond of.
Have you been to the citizens advice bureau to talk about other options ?
If you end up with lots of equity in your property at the end of the 5 year term they will use the equity to settle the outstanding balance of the debt. The debt will also increase because of the fees of the insolvency frim and possibly the statutory interest.
What situation are you in right now ? If you are paying each creditor each month at the moment, I could suggest the route that I took, that was to set up a debt management plan (DMP) through stepchange charity, they had it in place within a month, one payment to stepchange monthly and they write to all your creditors at least then youre interest is frozen and you're not paying any interest and only paying down what is owed.
They may even say a debt repayment plan isn't the best thing for you and you should do an IVA, just say yes, I'm thinking about it but a debt management plan is all I want for now as not ready to commit to an IVA at this stage.
Then speak to a few companies that don't feature here heavily as companies complained about a lot (that rules out the like of Grant Thornton).
There is no rush then, as your interest payments have stopped and you have breathing space. read my blog for an idea of why I think this is a good idea (link below).
Out of interest £90 over 60 payments is £5040, that is payments would would make into an IVA, the IP would then deduct fees from this so your creditors may only see £3-4K or even less if there were creditor meetings or complications along the journey.
You may find an IP who would be able to help you do a lump sum (single one off payment) IVA that only lasts a year if a friend or relative can lend you that sort of money ? Any asset in the house may also be taken into account at todays value, rather than in 5 years time when value may have increased but so would fees and interest.
blog link below.
ps a further thought, if your mortgage is £90k and property value is indeed £140K could you not just re-mortgage and release the equity in the property ? turn 90k mortgage into a 123k mortgage, on a 140k property this is 12.12% deposit and clears your debts ? there are some good 90% mortgages around at the moment for example quick search
http://www.money.co.uk/mortgages/90-mortgages.htm
of course this is no good if you have bad credit history already and have defaulted and might not be able to get a new mortgage, and with an IVA stamp on the credit file rest assured, as I have found from research - no one is going to offer you a mortgage/re-mortgage until it drops off your files in the 6 years plus future.
The reason they are saying no one will give you a re-mortgage is because it seems they are dead scared you will try and clear your current debt problems that way - have you tried that route first ? it must be much more favourable, even if it meant getting someone onto the mortgage with you so your multiple of earnings combined were higher and existing debt didn't reduce the combined amount prepared to loan. 3-4.5 x earnings (less other debt) combined.