Bit of a long shot but did anyone manage to get footage of this? I'm over in Oxfordshire so obviously wasn't there myself, but I've been following a few UAP tracking groups and Tuesday night threw up some interesting chatter across different locations, not just the lake.
What I'm curious about specifically - were the lights at the corners static or did they pulse? The triangular craft reports I've looked into tend to split pretty sharply between the TR-3B style black project explanations and something older, and the lighting behaviour seems to be one of the better ways to differentiate them based on witness accounts I've read.
Also how high up roughly? Even a rough estimate helps. Someone in one of the Discord servers I'm in mentioned a similar sighting over Indiana around the same time which would be worth correlating if the timings line up.