So I've been planning this shoot for a few days. Everything pointing to be a cloudy afternoon, with skies clearing around 7pm to approximately 20-30% cloud cover. I can cope with that. Get on the train - it's supposed to arrive at 6:30pm. It arrives just before 7pm. Not a cloud in the sky! Awesome! Walking to the reservoir using torchlight to see where I'm going - For the first time ever I see a car pull in behind me on the road and head towards me. I ignore it, but it pulls up beside me. Hooray, Police! They were really nice - When I mentioned I only had 2 hours before the last train home, told me to enjoy the night and hoped I got some good photos. I got inside and walked up the reservoir on top of the dam and noticed that there was a cloud on the horizon. Spent about 45 minutes there and then decided with my last hour that I would head down to the viaduct to see if I could get something from there. It's about a 10 minute walk to the viaduct, mostly because of having to walk around the river. By the time I got there, the clouds were building and I managed to get enough shots for this panorama, and then about 5 minutes later there were no stars. I have no idea where all that cloud came from, but it was seemingly out of nowhere. I hung around as long as I could, in the hopes that the cloud would leave as suddenly as it arrived. And it did..... 10 minutes before I had to leave for the train station, there again wasn't a cloud in sight. :( So it wasn't the most successful night, but I love standing there watching the stars, so it's always worth it.