You will need to get permission from your IP before looking at any car finance but you will also find that interest rates will be high.
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
Most of us in an IVA had to rely on good old 'E-Bay specials', until we were out the other side. Moneybarn are the only firm I know of that will consider those still in an IVA ( with the IP's permission) and, if they cannot assist, I doubt you will get reputable finance for a while.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014 http://foggy.blogs.iva.co.uk