Last Sunday we saw a whole series of model hot air balloons take off from behind some houses in our neighbourhood one afternoon. They looked beautiful and flew up really high. Now I totally forgot about them until tonight when I was in my back garden and I saw what could only be described as 3 UFO's fly in triangular formation overhead at great speed for a long distance and then change formation into a straight line. At 1st I thought they were 3 helicopters but there was no sound. They looked like bright orange balls of light with a slight flicker. (Not enough to be lights from planes) I thought maybe they were 3 microlights. And then 15 mins later another 4 flew over! So with my paranoia I search the web thinking maybe this is some stunt by Thames Water to monitor our hosepipe ban. I found this site: http://www.overflite.com/ which shows how to make a model hot air balloon out of birthday candles, McDonald's straws, and dry cleaner bags. This to me sounds extremely dangerous. What if one of these were to catch fire and fall on a house or a forest. Now according to that website this is not a new idea but something pranksters have been doing for years to freak out people and make them think they've seen UFO's. It's new to me though. So I was wondering if anyone else has seen this and is this going to become the next dangerous craze to (ahem) 'take off'