Philbky, firstly I must apologise to you and Concorde, as I meant to write "the fastest SUB-SONIC trans-Atlantic crossing" DOH!
As I mentioned in my post, fuel and weather would play their part in any comparison, as would the exact distance traveled, payload and various other factors. I have read about the VC 10's record several times in various places soI assume it is accepted knowledge rather than urban myth or wishful thinking, so I just offered it here for the discussion!