Similar experience here - about three years ago, over the fields near Avebury. Dead quiet night, no wind, and this amber-ish light just sat there above the treeline for a good four or five minutes before moving off at a pace that no drone or aircraft I know of could manage. No sound whatsoever.
Few things worth thinking about with yours:
How long did it hover? Sustained hovering with no engine noise is the detail that always interests me most, Did it change colour or brightness? The one I saw had a subtle pulse to it, Any effect on animals nearby? Dogs, birds going silent - that sort of thing
I've done a fair bit of investigation around the Wiltshire area and the proximity to crop circle activity here makes me wonder whether there's a genuine pattern to these sightings near treelines specifically. Something about the landscape perhaps.
Worth checking FlightRadar24 and the local RAF schedules first just to rule out the obvious - I always do that before jumping to conclusions. But honestly, some things just don't fit the conventional explanations no matter how hard you try.
Would love to know roughly where you are geographically, if you're comfortable sharing. Patterns across locations is where the real research starts. Anyone else got similar treeline sightings to add?