Arriving from the US at T5, and have onward travel to GIB departing from T3. Connection is tight - 1:45. Looks like staying airside, following the purple 'connections' signs and taking the bus between terminals is the way to go, though LHR's own website is rather silent on that idea. The LHR website also suggests my layover time is too short and I should re-book. Ha.
Am I correct in sticking to the bus to change between terminals? Traveling on a single PNR with 5 people - if we miss the flight, it's the last one to GIB that day. I'd prefer for that to not happen...