2. Given that that there is no PM call of "No Flare", how much chance is there on a Cat3b/Dual approach in 75m RVR, of avoiding a heavy landing if there is no flare and is there anyway of avoiding a 700fpm anding?
The reason that "No Flare" isn't a call is that, according to Airbus Technical and Training, there is no failure case which would only lead to FLARE mode not engaging. In other words, if you have LAND by 350', you will always get FLARE, unless you have some sort of system failure in the intervening period, which would lead to a go around anyway (triple click, master caution, autoland light etc.) Therefore, "No Flare" would be a superfluous call.
Regarding the RA fault question: surely it depends "how" it fails. The autoland light will be activated if it fails in such a way that a >15' discrepancy exists between the two RAs, even if only momentarily, thereby mandating a go around in the absence of sufficient visual references.