London Heathrow Airport 中, 澳航及英航是否在同一terminal?

Oh no need to worry! although BA is in terminal 1 and Qantas is in Terminal 4, it's relatively easy to connect your flights between these terminals.

Can have a look of this website: www.heathrowairport.com for more info.

Connecting from Terminal 1 International to Terminal 4::
Your connection will take approximately 70 minutes, from landing to departure gate. Make your way by foot to the Flight Connections Centre, pass through customs and security and then if you need to, visit your airline's ticket/information desk before taking a coach to Terminal 4.

應該不是，因看BA大部份線會自已一個terminal，所以QANTAS應該唔會同BA同一TERMINAL