Resurrecting this thread... is the bus still the quickest way to transfer between T3 and T5?
I'm arriving in to T3 on BA924 (NUE-LHR) on Thursday, arriving 13:35, and have a flight on a separate ticket booked to EDI leaving T5 at 15:20. I'm a victim of my own incompetance as I didn't realise the inbound was T3 until I headed to the airport to fly to NUE yesterday <facepalm>