Big Air - Its not an issue with Phase 2 doors. As far as a/c fitted with phase 1 and the bac1-11 incident, the CAA reckon its less likely than a cockpit incursion, so we're safer with the doors than without. Its all a balancing act, safety-wise.
As for telling the pax, if they didnt know or suspect, I probably wouldnt tell them. Why bother, it makes no difference to the outcome and after being fed on a diet of headlines like this one they might well feel unsafe. Having said that, I certainlly dont feel critical of the FO in this case - who it sounds like did a professional job.