Why do you wish to terminate your IVA? You can end it by not paying for three months and your IVA will fail. If you check the Insolvency Register you should find your IP there to contact and ask for it to be terminated.
Your credit record will still be shot and creditors will start chasing you again.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk