Did anyone else notice whether the craft made any sound at all during the hover phase, or was it completely silent?
Asking because I've been cross-referencing a similar triangular sighting we had outside Glasgow back in March, and the acoustic signature (or total lack thereof) seems to be one of the more consistent data points across these encounters. My Zoom H5 was running during ours and picked up absolutely nothing in the audible range - but when I ran the recording through Audacity with the bass frequencies boosted, there was a distinct low-frequency oscillation sitting around 18-19Hz, which is right in that infrasound territory that supposedly causes the ". Uneasy feeling". Witnesses often report.
A few specific questions if you can remember:
Did you feel any physical sensation - chest pressure, disorientation, that sort of thing?, How long did the hover last before it moved off?, Did it accelerate gradually or was it the classic instant departure that keeps turning up in these reports?
The triangular configuration with what I assume were three corner lights is showing up constantly in UAP databases right now - whether that's TR-3B black programme stuff or something else entirely is the eternal argument, but the behavioural patterns are genuinely striking when you stack the sightings side by side.
If you recorded anything on your phone, even just video with the standard microphone, it might be worth running it through a spectrogram analyser - Spectrum Analyser Pro on Android does the job reasonably well for a free tool.