Originally Posted by euromannn

Thanks, airside vs landslide were new terms to me and your explanation is very thorough with time constraints listed. One would think a 3 hour layover in an airport would be easy to traverse different terminals but not at Heathrow. I do have a EU passport that I could use to go between T3 to T2 and back to T2 but prefer to keep traveling on US passport as it may cause confusion.