Triangular lights seen over Swansea and Port Talbot

I was amazed (and elated) to see that somebody else had reported the same incident on this site. I remember it being in the local newspapers the next day and that numerous people had reported it. If I remember rightly it had also been reported to the coastguard.
 I was on my way to football practice at the time. We practised on a small field under some street lighting close to Aberavon beach. On our way there I noticed some lights in the sky behaving oddly. At first I thought it  might be aircraft dogfight training as the lights seemed to be dancing around each other. I then noticed what seemed to be a cylinder shape at the centre which could only be defined by the lights on it. I could not see any physical solid shape. These lights continued revolving and cartwheeling and slowly moving away towards a slightly misty horizon until they dissapeared.
 This sighting alone amazed me as it lasted what seemed a good 10 minutes which gave me enough time to discern that these lights were not aircraft of any sort that I had ever seen.
 About 20 minutes later as we were playing football I noticed more lights in the distance heading towards us. I stopped playing football to clearly observe them. They were moving slowly and at first I saw four lights that as they got closer changed into three lights and a triangular shape was clearly discernable.
 To my amazement the lights passed directly overhead. I couldn't make out any sound or see any shape in between the lights. I can only guess at the size. It seemed to be about the size of a British Vulcan bomber or bigger. It passed over slowly and as I mentioned earlier there was absolutely no sound.
 Then, not long after it passed overhead it  pointed upwards and ascended vertically at exactly the same slow speed until it disappeared. This amazed me as I know of no aircraft that can do this for that duration and speed.
 Shortly after two aircraft appeared which led me to the conclusion that they were looking for these lights.