I agree with Brink.
The disclaimer, and the contract both stated that. It doesn't even require a Legal Jargon-ist to help. It's just common sense.
By the use of "Bloke", I know you're British (Flag Confirmed it
), but Civil Court is something we have in the United States. You can always look into this option to fight it, if he persues it. Any judge in their right mind, would side with you.
All I have to say is, what an ass he is. I'd fix it, and charge him the premium it would for a tech support.