Two metalic elongated hexagonal objects rotating clockwise at a rate of 1.5 to 2 revolutions a second - very measured and precise in their pace. Assuming that they were at the same altitude as the aircraft that were flying nearby them, they would be 2.5 to 3 times the size of what were most likely fighers from Farnborough which I am accustomed to as I live under the flight path - I am assuming that these aircraft were at their flight ceiling as they were as high up as I've ever seen them, and the objects based on how they were reflecting the sun were at a similar altitude. Due to the altitude it was difficult to discern any other details. There was no audiable sound from the objects.

Eratic movements away and towards one another with intermittent periods where both or one were completely stationary, with the exception of the constant rotation. Both seemed able to accelerate and decelerate very rapidly.

The UFO's were very close to GCHQ's Oakley site, and were clearly of interest to several aircraft that came from the direction of RAF Fairford flying in pairs making a right angle around the craft - not sure if the objects remained in the sky any longer than this, as we left, but they were moving in a meandering manner roughly towards to GCHQ Oakley/Cleeve Hill area of Cheltenham.