Drone technology has grown dramatically in recent years.
The highly sophisticated ones are flown remotely from Nevada and can release weapons accurately, to within one metre of target.
The target can be anywhere on earth - including Afghanistan, Syria and Hyde Park. But, it isn't only the Americans who have the ability.
It may well be that the perpetrators of this long and seemingly well planned episode are an organisation/country - flexing their muscles.
So far this apparent capability has only produced commercial damage, as well as personal inconvenience.
Instead of a chap - operating his new Christmas present - from nearby Crawley, as has been suggested.
