Finally got to watch the video, interesting in parts for sure but it doesn't answer the specific question I asked regards the cause of the folkeston colony losses. I'm not questioning the truth just trying to get a grip on the facts. If the hornets get established anywhere in the UK, and I personally think that they probably will, then it's a fair assumption that I'll be deep in their territory so I'm interested in any real life experience that can be offered but I'm at a loss as to the apparent secrecy regarding the specifics.
Did the colonies stress and overheat, did they abscond, starve or was there another reason altogether, perhaps colonies succumbed in different ways?