Hi! We're landing at Heathrow via Icelandair at 11:45 on a Monday in July. We're going to then fly over to Nice and we're considering getting all the travel done on that Monday. I know there can be delays, so would it be a reasonable plan to land and then take a flight out of Heathrow at 17:45 or 20:15 via British Airways? Can someone provide me with some insight on navigating the airport? I am assuming we'd have to collect luggage (yes, we are checking luggage, can't change my mind) exit through customs and then reenter the airport anew. Yes?
I appreciate all your help!