Yes, great show, I wonder if Mark Gatiss ever visits these forums? He mentioned time-slips and other Fortean phenomena...
The Sproatley alien in the window case got my attention and found some source information here that includes the alleged photo:
It is a classic example of when the UFO phenomenon/paranormal focuses its attention on one particular household and includes poltergeist-type activity in addition to the craft and entity sightings. It has elements of other classic UFO cases, not least in that it was unpleasant for the family at the centre of it.
Does anyone have anymore on this case and the Hll UFO group? It is a really intriguing and Paul Sinclair has written about a similar, rather dark and distressing case from Yorkshire in the 1990s that involved a garage workshop, car mechanics, poltergeist-type activity some sort of UFO landing (https://truthproof.uk