I've seen this a lot in the past. Lately almost every time I cross the pond. They're most visible about an hour or two before sunrise while flying eastbound. First time I saw them I thought they were flares or afterburners, until I actually saw such things while flying near an overwater warning area.
So I put a night sky app on my phone, and somewhere between 30 and 20 West longitude one night, there they were again. Plug in our lat/long and zulu time, point my phone at the lights, and sure enough, a constellation of Starlink sats crossing the horizon.
The patterns they orbit, how they criss-cross one another, and how they catch the sunlight from over the horizon, makes it look like 3 or 4 lights "dancing" around one another.
As it turns out, there are more than a just few of them up there at any given time:
https://satellitemap.space/?constellation=starlink&norad=52339