Are you already in an IVA? If so then you are unlikely to be able to get a loan for a car.
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
Not only is it unlikely that the lender will approve the loan, but you would also need permission from your IP -- which, again, is unlikely to be forthcoming.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
No your credit rating is likely shot and you will almost definitely need permission from your IP for credit over £500, which they won't agree as if you have surplus funds available to make repayments, you have enough to increase your contributions.