Thanks for all the feedback.
I have started the process with someone called
www.w3debtsolutions.co.uk
Andy, My disposable income after all household expenditure is 382 pounds and my wifes surplus disposable income is 188 pounds.
At the moment on my DMP my wife contributes around 18 pounds to the payment of 400 pounds (only 10 percent of surplus)
With the proposed IVA she will be contributing 88 pounds a month based on 470 payment (47% percent of surplus)
I am going to ask them regarding costs today as to how much things will workout if the application fails etc.
And with my wife going on maternity leave in December I have been recommended a stepped IVA which I am comfortable with so that we can get through the months where she is on statutory pay. After this she will be planning to go back to work on 3 day week (same as now).