That's an internal flight. Add some time for people + luggage to leave the UK, and to enter Australia. (There is time for both countries to inspect luggage eve

That's an internal flight. Add some time for people + luggage to leave the UK, and to enter Australia. (There is time for both countries to inspect luggage even if we don't see them doing it.) Then add some more because the flight is much less regular and costs £1000 rather than £100, so missing it has a worse outcome.