Hi Will. I've heard the Wilson tape. (sadly don't have a copy). I seem to remember part of it turning up on Private Eye xmas flexi disc one year..."Why are you asking me these questions? You don't ask Mr Heath were he gets the money for his yacht? When you've asked him, come back and ask me...And I don't want this getting out, I've never been to the BBC without something leaking!"
Hardly Jonathan Ross standards, but amusing for its time!