Group of 5 people parked up and as we stepped out of the car i look up at the night sky to see a light moving across - after informing my partner to look at the light we both notice a second light. then another and another, until we realised a perfectly straight and spaced out light of identical lights moving in unison across the sky right above us. we inform everyone else to look up and we all stand watching light after light moving across the sky. we observed planes also flying across sky so we are 100% sure these were not planes - as the conventional aviation lights could not be seen. these lights were flying in perfectly spaced unison and over the 10 minutes we must have observed over 50+ of identical lights flying at extremely high altitude across the night sky. i moved to see where at the horizon the lights flew in from but it seemed as if the lights slowly appeared from nowhere above the horizon. after that light came in and moved a set distance along, another light would slowly appear from the same point etc.