It is very unlikely that you would be granted credit even if your IP was agreeable. What you can do, however, is request a payment break and use the missed payments to pay for the cooker. They will be added on to the end of the iVA.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
There are several charity organisations who may be able to help. Local churches can offer some financial assistance . Also look on line for recycle organisations in your area (freecycle, etc). Best of luck