Agree with Harley that IVA is pretty pointless as no home to protect. If he insists on doing one it is better to go to a reputable outfit such as Payplan/Shaws or Grant Thornton, rather than one of the TV & internet advertisers.
Whatever he does, his credit record is almost certainly shot for 6 years. If he goes on without bankruptcy or IVA it could well be shot for a lot longer, as paying off in full would very likely take much more than 5 years.
He should look at the bankruptcy booklets on insolvency service site.
Does he own a car? If so, it could be at risk in bankruptcy unless he can show a definite need for it for work.