I think as others have said you need to sit down and have a difficult conversation with your son, he needs help but not from your pocket, he needs help managing his money. The citizens advice bureau can help am sure and there must be other groups/organisations out there who can help perhaps by suggesting he consolidates all his debts into one amount that he can then pay off with an agreed sum regularly.
But am only repeating what I have heard about debt management, you could do a little research first on google to see what kind of help is available.
All the best with this thorny problem.
Do you think you know when you are going to die?


, I just wondered. 