Hi, might I ask who you are with ? It seems they are not very pro-active, which means you are going to have to be.
First check your proposal -- their is often a clause in there that allows the IP to reduce payments by up to 15% without the need to consult creditors. Flag this to your "advisor".
Then, if no reduction is forthcoming, the other options are for you to put together a full and final offer, if you have someone willing and able to gift you the lump sum -- this would be in the region of your monthly payment multiplied by the number of months remaining, plus 12 for equity. This can be drafted so that, if refused, the IVA carries on it's normal course. A template for the F&F offer was included by Lisa in this thread:
http://www.iva.co.uk/forum/topic.asp?TOPIC_ID=78770
Of course, as bitter a pill as it might be, the option of an extension could be reconsidered.
The final option would be to ask for a variation requesting the creditors accept payments to date as a full and final. The problem with this is you are stating that you cannot continue, so, if this is refused the IVA will fail.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014