I'll go out on a lim here...
I discussed this particular case on another forum some months ago. And remember dismissing it, because for if nothing-else, my gut-feeling was that it was a hoax perpetrated by the whole family. [including the family documentary maker]...Not that they deliberately created the anomalous-looking sight!...but rather, they know exactly what they had filmed, and decided that it looked mysterious enough to "Cash In" on the damn-thing!
The 'chimney idea' never crossed my mind.[and still seems rather remote]..But I do still favour 'something-on-the-hill theory'...And reviewing the first instalment of the "Genuine UFO" film,..I noticed that the lady mentions that the lights emanated from the general direction of "The Denbigh Golf Club"!....And being an occasional [but excellent] golfer myself,...I know that my own golf club does it's general maintenance through the night!....And I hope that I am not being too sceptical here,...but after watching the tape again, I believe that a group of brightly-lit ground-staff vehicles , innocently going about their duties,...might just look like the "Genuine UFO" in the Denbigh film?
Anyway...I have left a message via the club's website, requesting information on any 'nocturnal maintenance work' that could possibly have been carried out on or about the 3rd of january.
...It is late sunday evening here...So i'll wait and see if i'm anywhere near the mark on this one.
Hiya 1963, and yes you're right that the golf course lines up. I had very similar thoughts as I was looking (and am still looking) into it.
Unfortunately, the golf course itself is over the hill and not visible from the point of view of the camera. Excellent thinking though, and I'm currently thinking that it may have been a tractor or something similar on the field just this side of the hill.