Looking at the Greenwich video linked, it would appear to have been early hours of the morning, judging by the lack of turbulence and shadow lengths. The wide angle camera makes it virtually impossible to determine whether the flight was at 200 feet or a 1000 feet. Some very nice photography and views that would not normally be accessible to the public.
I am aware of videos posted from the US where drones pace alongside aircraft filming landing and taking off at local fly ins. Nobody seems to object, but I have to assume that the pilots are briefed that a drone may be flying parallel to their aircraft on approach and take off. The drone pilot is a current commercial pilot, so one has to assume he knows what he is doing! The drone in question is a DJI Mavic which weighs around a kilo, so unlikely to cause major damage in event of a collision, but small and hard to spot from any distance away.
Prior planning and common sense are a lot more important than blanket bans which are impossible to enforce. These drones are out there and there are more of them every day. It certainly won't be that long before commercial drone operations start to rival commercial aircraft flights. If commercial operators have to submit to licensing and regulation, how long before they start demanding protected routes and flight areas, especially if they become a majority and are paying out good money to fly? Be careful what you wish for.
There are idiots out there flying private planes with no licence, insurance, or formal training, it isn't just drone operators.