Don’t misunderstand me - I’m not saying he was not protected, but that any such protection (as well as his knighthood) was not for the suggested reason of Thatcher being able to count on his vote. I’d guess that if there was any cover-up conspiracy it was for more murky reasons. So I guess we may be agreeing.
(And perhaps you meant to comment on some other part of my musings? Because it really IS true that he was a member of the Liberal party and not the Conservative party.)