Bit of a long shot but did anyone record it? I ask because I had almost the exact same sighting over the Wash here in Norfolk about three weeks ago and I'm trying to work out if this is the same craft type doing a kind of circuit or if they're completely unrelated incidents.
The shape matches what I've been seeing reported elsewhere - no nav lights, completely silent from what witnesses say, slow deliberate movement rather than the usual instant acceleration stuff. Mine behaved the same way before it just sort of faded out rather than flying off.
Genuinely curious whether anyone's mapped these sightings geographically because the pattern might tell us something. Is there a database people are actively updating with triangular craft specifically?