Heathrow T1 to T3??
There was a thread on here a while ago about T3 - T1. I am going to be transferring in the other direction soon (T1 domestic arrivals to T3 international departures).
I will only have hand luggage and will be on a standby. Is it going to be quicker for me to go through flight connections or exit landside and walk over? I think the tunnels will take me underground to T3 if memory serves me right....