My attitude to this, knowing only as much about it as Jane's Defence Weekly can tell me, is that you'd be far better off getting whatever airframes you can and gaffer-taping the bombs on at a later date if it turns out that's what's required. Cancelling multi-billion military orders always seems to waste huge quantities of money, and in the current climate I'm shocked anyone in the RAF would be interested in turning down aircraft - on the basis that if you refuse these, the money probably won't magically become available for other things.
Phil