I would say that you are lucky that your creditors did not spot the glaring inaccuracy in your IVA proposal in that you would surely be able to afford to raise equity during the final year, given that you are paying £750 per month currently into the IVA.
It may also com across as a little rich for you now to be suggesting to do exactly what a year ago your proposal said you would not be able to - albeit I accept that this was drafted for you by a professional company and that you relied upon their advice.
Many of my clients, with less disposable income and considerably less equity have been forced into accepting this very common requirement, which I personally find is unfair but is pretty industry standard.
I also am pretty amazed that no professional valuation was carried out on your property. How did your IP validated its value? And was the property, the outstanding mortgage and the equity sum fully disclosed in your statement of affairs?
That said, the proposal was accepted in its current form by your creditors, and the property is legally excluded and yours to deal with as you will. There is no harm in discussing the possibility of a variation with your IP, but beware clever creditors who might just spot the issue they failed to spot in the first place - that you can afford contributions and also have substantial equity.
I think a chat with your IP is now in order, as he/she will have detailed knowledge of your case and not just a brief snapshot. I wish you good luck and don't forget to let us know how you get on.
Regards, Melanie Giles, Insolvency Practitioner