Peter, I know I've said this before, but I think you would be doing everyone a valuable service if you can substantiate this assertion. If true, it's a serious allegation that should be made public. If not, then it's just good-ol' FUD. Of course, it might be true but unprovable, and you have my sympathies, but the basic argument is still valid.
If you feel strongly about this, and it appears that you do, consider how much extra weight your evidence would have, if you released it now before the decision is made? If the decision goes the way you expect, you won't easily overturn it after the event. Natural justice would be the loser, surely?
If was part of one of the consortia who are bidding in good faith, it's something I would want to know. Badly.