The reason for the orange colour is due to the scattering of light by the atmosphere. When the moon is near the horizon, the moonlight has to pass through much more atmosphere than when the moon is directly overhead. By the time the moonlight reaches your eyes, the green, blue, and purple pieces of visible light have been scattered away by air molecules. You only see yellow, orange, or red.
Sometimes pollution can cause colourisation of the moon, though this is unlikely in Swindon.
Thankyou Patrick Moore
