Numerous airlines fly from Heathrow to Austrailia, from different terminals.
Three
That depends on which airline you are using. British Airways flies from Terminal 5.
Delta uses Heathrow terminal T4.
Yes, there are three stations: Heathrow Terminal's 1,2 &3; Heathrow Terminal 4 and Heathrow Terminal 5. They are all situated on the Piccadilly Line.
Heathrow Terminal 5 is on M 25 motorway.
About 20 minutes.
Terminal 5.
There are about 30 miles from Whitechapel to Heathrow terminal 3.
Terminal 3
United Airlines uses Terminal 1 at Heathrow airport.
Terminal 1 - which is the biggest of the two.
Lufthansa operates out of Terminal 2 at Heathrow Airport (IATA: LHR, ICAO: EGLL)