He could do a DRO for that amount but speak to a few companies before making any decisions.
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
A little depends too on whether your son plans to keep the car that is on finance. On most car deals the finance is secured on the car and could not be included as a debt. I suspect this would be a problem in a DRO. But certainly an IVA or a Debt Management Plan are potential solutions. So much depends on his income and outgoings.