certainly heard the spackx was visible from UK/Ireland, but I thought the photos one guy put up was 2 dots (I’ll have to search farcebook to find it again).
from that ISS thread, I sussed out it wasn’t ISS, cos the times didn’t match at all.
solar arrays don’t reflect Sunlight. 1. they absorb as much light as possible. 2. they point towards the Sun (although in that very first orbit could be pointing anywhere, while it acquires the Sun, and gets itself all pointing the right way).
4 lights in a line at that altitude would be 4 separate objects. Only time I’ve seen that is an Ariane night launch when the boosters drop off, or Shuttle about to rendezvous with ISS.