Rainbow skies

The sky over Hull, snapped on my way to work from inside the car (at a stand-still in a traffic jam) on my phone, through the windscreen. Not the best circumstances for an amazing photo, but I've never seen the sky look quite like this. I wondered initially if it was the Northern Lights, but apparently it is to do with the light refraction on ice crystals in the clouds. Beautiful and definitely a change from the normal boring 'traffic-jam' to work!