Bit of a long shot but did anyone manage to photograph them? I'm over in Somerset so obviously I wasn't there personally, but I've been collecting reports of light formations over large bodies of water for about two years now and Lake Michigan keeps coming up.
The reason I ask about photos specifically is that I've noticed a pattern in similar sightings where the light configuration changes subtly between witness accounts - and sometimes a photo can actually settle whether it was a formation or a single object doing something strange.
If you did see them, roughly how long did they stay visible and did they move at all or just hang there? I had a witness from a Lake Erie sighting last year describe them as "patient" which is a weird word to use but it stuck with me.