Look out for a swarm of unmanned flying objects in Greenwich

If you’re struggling to get to sleep tonight and have a view of the Millennium Dome, look out for something happening.
There will be a swarm of 400 unmanned aircraft systems (UAS) flying over the Thames in the vicinity of the Greenwich peninsula tonight and tomorrow night. Why is unknown, but you don’t hire 400 flying machines and issue a traffic warning to the boats unless you’re filming something fairly decent.So, the swarm of 400 UAS will be in action over two nights.Tuesday