We are flying from Rome FCO to Heathrow LHR to catch a flight from Heathrow to San Francisco International. Terminal 5 services both the arrival flight and our departure flight on British Airways.
The question is, is 1 hour and 20 min. layover enough to do this transfer? British Airways seems to imply it is, but I imagine we will have to go through international security for the LHR to SFO flight. We will probably carry on our luggage.