It will depend on the individual lender whether they will accept him, depending on his credit check.
Was his IVA started more than 6 years ago ? If, so it should no longer be showing on his credit files, which will be a boost. Also any account defaults correctly dated should have disappeared.
Might be worth him grabbing a copy of his credit reports to check what is on there.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014