That's new to me too. And what are the definitions of "Road" and "Waterway used"? I think "Navigable Waterway" might have a definition in law.

The definition was established in the high court when the CAA prosecuted the kind and very popular instructor/examiner Eric Thurston, flying from Stapleford Tawney He was found not guilty. Eric was conducting a PPL Skill test. There is no definition in the ANO on what constitutes a 'structure'.

The judge however decided to define, although not central to the case, that which he considered too vague, and to be of assistance for the future. A road is a structure there for the purpose of conveying people and therefore it is not unexpected to find people and vehicles, so no defence. A waterway in some cases is the same. If you fly within 500ft of a person or vessel in a busy estuary or river when it is known to be used by people, such as a pleasure boat even at the last minute then there can be no defence. If I remember it correctly he also clarified: should the flight be crossing a field of crops then it could be a defence, should a romantic young couple pop up unexpectedly from amongst the crop. It is reasonable to expect the field of crop to be normally free of people. He did not consider that the fencing surrounding a field counted as a structure for this purpose.

And so also is a runway if for some reason its not legal to land on it.

People, vehicles, boats I have always understood to be subject to the 500' rule. Roads, fences, water, pot buoys, I regard as not subject. It's the pilots responsibility to ensure people, vehicles, boats, and any other possible items are not present when flying low other than when taking-off or landing.
No change to Airlaw by the Judge's determination.
PS. I assume the Court was high enough for decisions to be quoted by other English courts. But even so, they would be unlikely to affect the interpretation by a Scottish Court, although Aviation is reserved to Westminster.

Probably wouldn’t get to carried away with them drone delivery’s. Once a few drones turn up at peoples door step with a bomb of a litre of Molotov cocktail that will probably be the end of drone delivery’s…

From ANN:
Walmart Begins Drone Delivery Across US | Aero-News Network

I'm pleased to see a prosecution of a drone operator who was found to be flying dangerously close to a BBMF Hurricane. This needs publicising more on the 6 o'clock news.
TOO

We know who did the car bombs. Will we know who does the drone bombs ? Will we know who hacks the drone and makes it fly at 100 miles an hour straight at you ?

Doubtful… then how will it be stopped… ground all small drones perhaps…