Look out for a swarm of flying drones over Greenwich and Alexandra Palace

Something to look out for, as there will be two swarms of unmanned flying objects over London on Monday evening.
(wont be over the dome, but it’s the best image I have)
The swarms, each made up of 100 flying drones, will be flying over Hornsey and Greenwich, and according to an air traffic warning, the swarms are likely to be centred above Alexandra Palace in Hornsey and the Royal Observatory in Greenwich.
That’s the centre point of a radius of restricted air space, but the centre is