Well for once I agree with Nick Pope, we finally have a clear photo of an alleged UFO and it has turned into a dogfight between skeptic and believer. Over at Metabunk they are falling over themselves to prove it is a hoax but it has descended into speculation and counter-speculation, the mods are getting twitchy and they are no closer to a solution. Meanwhile, over at Reddit true ETH believers are ranting at those who doubt the evidence.
The object was described as having the ability to accelerate vertically with only a gentle hum. As others have pointed out elsewhere, this is heading into anti-gravity/recovered alien tech territory, which is all very 90s. It is also very convenient as it reduces the number of potential witnesses to a minimum, as opposed to, for example, disappearing horizontally in the direction of Pitlochry. The only technology openly out there that matches this ability is a drone and I suppose it might have been an attempt to make a drone with stealth capabilities (there was a Bonnybridge sighting a couple of years later that was researched by Malcolm Robinson and that with hindsight matched the size, movement and noise of a drone).
Anyway, i feel this thread will run out of steam without any fresh evidence. I certainly know that every time I veer towards one solution there is an argument made that pulls me back again. Hopefully David Clarke will uncover some new evidence and he and his team have done an excellent job so far.