Rainbows..... in curved air?

A gorgeous rainbow over Grangemouth refinery today - an interesting contrast between science and nature. I was on my way back from my college reunion when I spotted it.
There was actually a beautiful full bow,  but I couldn't find a place to catch it all, still, I'm glad I caught this because a moment or two later it was gone.
I've always enjoyed looking at the refinery, my room in college looked out towards it for most of my the years there and some of the lights in the sky at night were stunning.

The other half is in today's extra pic