Fire in the Sky

Driving home tonight I saw this massive flame in the sky. I think they might be burning-off whatever it is that they burn-off at Grangemouth. If that's what it was then the flames must have been massive to see them here. It's not a great image as I stayed in the car (I was sat sitting!) and rolled (or rather pushed the button) the window down. I didn't get out because a) it was too cold b) it was too dark c) it was too late and d) I was too tired. I did notice that the flame kept changing shape and what I seem to have ended up with is a ball of fire that looks quite sun like.