I'm pretty sure that John Wayne only appeared on Parkinson once although a friend of mine disagrees and stated that he was on his programme at least twice but I think this is wrong.
As I said previously John Wayne's answers to Parkinsons question were short, sharp and witty and on Parkinson the guest usually waffles on endlessly about themselves and this as we all know was no John Wayne's style.
I also agree with Arther that its ludicrous for Parkinson to receive a knighthood for doing this show, the knighthood I am afraid is an honour that has been demeaned due to some of the undeserving recipients awarded it and Parkinson is one of them.