Did'nt help much at LHR did it, would it have saved the day at BZN ?
Actually, it did
Cat IIIB is the reason that
only 60-odd flights were diverted/delayed.
The were not delayed because they couldn't get in, they were delayed due to the increased IFR separation that LVPs require to make the rollout safe.
That's with LHR's relentless rate of approaches...i fear BZZ would cope just fine!