Mate, this kind of thing stays with you doesn't it. Once you've seen something you genuinely can't explain, your brain just won't let it go.
I had something similar about two years back - hovering light over the fields near my place in Essex, totally silent, no flashing nav lights like you'd expect from a plane or helicopter. Just a steady pale glow sitting there for a good few minutes then gone. Still think about it regularly.
Few things worth asking:
How high above the tree line roughly? Low and slow behaves very differently to something at altitude, Any sound at all? Even distant hum?, Did it move before it disappeared or just vanish?
The hovering detail is what makes these sightings interesting to me. Drones are the obvious sceptic answer these days but most consumer drones you can hear pretty clearly at close range, and they don't explain some of the reported cases.
I've been dabbling with a Full Spectrum camera in the garden hoping to catch repeat activity in my area but nothing solid yet. Thinking about grabbing a thermal monocular too because lights only tell half the story.
Would love to hear more detail if you can remember it. Sometimes writing it all out helps you notice things you'd mentally glossed over. Others here will have good input too - there's some really experienced folks on this forum who are great at ruling stuff out (or not ruling it out 👀).