In reply to Kipper:
Welll, I thought E grades were supposed to take into account all manner of things; length, 'seriousness', remoteness (i.e. if you fall off and need immediate medical attention), sustainedness, objective danger, protection and, of course, technical difficulty in relation to all of the above. Well, the climbing on Breathless isn't a lot easier than BV; they're in a similar league from what I can judge, and if they're not, it's only because BV starts with a very hard boulder problem, which surely doesn't contribute that much to the overall seriousness, or E grade, of the route.
So, let's say they are of a similar tech grade (OK, not the same, but close).
Now consider one is short (perhaps short enough to survive a fall, certainly from the crux), at a roadside crag, not far from a hospital, with a good landing.
The other is on a remote mountainside perhaps two hours from a hospital, is sustained and over a hundred feet long and if you fall from the crux you'll probably end up with not even dental records to identify the red paste you will have become.
I know which one I'd give a higher E-grade to...