It was approx 10.30pm and i was looking out of my bedroom window and above the sports playing field near my flat i saw four very bright white lights in the shape of a diamond with two lights next to it on the right hand side,the same shape and size as the other lights.I didn't know what this could be but would describe it as if the Red Arrows were flying in a formation,obviously at this time of night could not be the case.Also there was no sound what so ever.After approx 30 seconds the lights changed into a square shape with the two 'odd' ones staying in the same position.They stayed like this for 3 or 4 mins and then just vanished.There was light cloud cover that night but they definatly did not go behind a cloud they just suddenly vanished.I watched the sky for about ten minutes but saw nothing after that.I was left feeling totally baffled by the sudden dissapearance of the lights and the fact that there was no sound accompanying them.We often have a police spotter plane pass over and i knew it wasn't an ordinary aeroplane.