Maybe we ought to have a think about the wisdom of broadcasting the real-time position of the PM's aircraft live on the internet. Can you imagine Air Force One doing that? All it takes these days is someone standing on the approach with a laser or a drone.
https://www.flightradar24.com/data/aircraft/zz336 - Click on the flight history for the two flights to/from Hangzhou.
(For those reading this at a later date, ZZ336 was trackable throughout it's entire flight from the UK to China and back again, while carrying the PM and pretty much every other notable name in UK politics to the G20 summit.)