2004-09-12 - Andover (UK/England) - Triangle

formation of slow moving pairs of rapid flashing lights possibly triangles

I was letting dog out earley morning sunday 12/9/04 about 5am,just getting light.I first noticed what looked like a satalite going east to west but there were 2 side by side.Are there satalite formations? These were obviously quite high up. Then going west to east came a rapidly flashing light red,white. Moved slowley and silently, about 500m altitude. As this crossed the sky another came into view directly underneath the first at about 200m altitude, moving same speed,in formation. This pair drifted passed followed by another 3 sets of pairs all going the same direction.The strange thing was that i could see the lights flashing down the side of the craft(?) and on the back could be seen two fixed lights(exhausts?) but the objects themselves were invisable.I first thought military helicopters,but the lights were too rapid and there really was no sound at all for something flying that low. Struck me as being like the flying tringles that have been reported. This was then followed by a standard plane going south to north, much higher, which I could hear.