I see Qantas are about to start research flights.
https://www.smh.com.au/business/comp...22-p52jm3.html
How would they route SYD to LHR?
Take off and set heading 319 degrees and just keep going?
The Great circle route takes you across the South China Sea - right through the middle of China, up the top of Kazakhstan and down, across Western Russia then down through Estonia and the Baltic to Britain...