Witnessed two lights, travelling from west to east, not in a straight line, changing formation

I stood outside my house and noticed two white lights, the size of medium sized stars in the sky. They were travelling along together which at first looked like a low flying glider or plane. Flying from west to east.
After a few seconds the lights moved closer together as they continued to travel, and then further apart. They continued doing this when they flew over me, and just before I lost sight of them behind a block of flats one light seemed to be travelling in front of the other.
There wasn’t any flashing lights, and no noise. As noted above they didn’t travel in a straight line.
They took 20-30 seconds to move from one side of the sky to the other, so were moving at a decent pace.