Didn't see it myself but my mate in Cardiff sent me a video on Thursday night asking if I knew what it was. The footage was shaky as anything but you could clearly make out three lights in a triangle formation just hovering there. No sound apparently, which is always the bit that gets me with these sightings.
Was it moving at all or just stationary? The one in the video looked completely still for a good few minutes then just went. Not faded out, not flew away, just gone.
Also how high up did it seem? Trying to work out if its something military or actually worth getting excited about.