I do several trip per year with a transit between T5 and T3. 2 hours is plenty as long as your flight is on time. If your flight arrives in T5B, you can get a bus from there to T3 - no need to go to T5. Can anyone confirm if the bus drives via T5C as well? It's been a while since I was in that terminal.
EDIT: corporate-wage-slave beat me to it
Last edited by speedymac; Aug 21, 2015 at 4:08 am
Reason: -