OIC yep the Q400 is not only quick and it's not just the cruise but the up and down rates as well. The numbers I've heard agree with your 5 mins slower on BHX-EDI but here's the kick, it does it on about half the fuel burn.
I reckon you blokes at fly BE need to get a grip of a T/P future. The word I've heard is that the bearded one has been spending a lot of time in Toronto of late negotiating a swop of the CRJs for more Q400s (seems they haven't agreed the ratio of Q4s for CRJs or some such but expect an announcement before very long) so it's D8s or quadrapuffs for you and more D8s than 'puffs.