Unknown lights hovering over Dublin, Ireland

I have just witnessed four brightly lit objects in the north of Glasgow. They all came from the west - three at first. Two were well in front of the other one. They moved forward but at the same time sort of bobbed up and down. They all had two bright lights and made no sound and did not flicker like aeroplanes.This was at eleven o' clock . The lights were all the same size and moved very