Chesty Morgan. At the airlines I've worked for, operating the A319/320 with just two crew members would not be permitted. Minimum crew has been four with an alleviation to lower that to three in order to get back to base.
Wiggy, I think you might have needlessly got your boxers in a twist over my comments. I said forgive me if I'm wrong because I wasn't 100% sure. But if BA pilots know the cabin/passenger emergency drills and shout commands (the most cabin crew specific SEP training) then genuine kudos to BA for training their pilots to that level. I don't recollect that being the case at my former BA franchise carrier mind.