In reply to Somerset swede basher:
Yes and no
The routines for the given grades are definitely WAY out. When I was bouldering/climbing 'well' a couple of years ago (7B/7c max), I couldn't complete the 7A routine. I've never been quite sure why it is this way - mainly I think because the BM boys wouldn't notice a 7A if it whacked them over the head. Maybe there's a bit of macho under grading involved too, or savvy marketing. I am convinced however that if you could complete the 7A set you'd be lapping outdoor 7As and reappointing at least 7c in the Peak.
The other issue of course is rapid gains/neuromuscular-adaptation, which BM *might* argue is taken account of in the grading. One definitely adapts quickly after a few sessions.
On the question of 2 finger hangs that depends I think. I can 2 finger dead hang even in a fat and weak state. It depends a lot on your relative finger lengths. For example my weakest pair is front two by miles. My back 2 is stronger.
Finally, the other issue is that the BM routines are power endurance oriented really, i.e. if you are unfit you will struggle relative to finger strength. For that reason Dave Macleod is critical of their routines in terms of maximal strength gains (as I understand it).