He might, but regardless of what he sues for, we all know it's Vallely's word against Wilson's word. Empty threat, IOW. I'm sure Paul Vallely is shaking in his boots. ;-)
Not sure it's empty, but I agree that Paul Vallely isn't worried about it.
Interesting case scenario. I don't recall any defamation cases where the allegation is based on a conversation between only the plaintiff and defendant, with no other witnesses. What would really be a hoot would having Wilson try to obtain a court order against Vallely, enjoining him against speaking out further.