Ive never really believed in the whole chem trails thing but about every month or so the usually clear sky at the back of my house if filled with a grid pattern. What worries me is that im not to far away from Portland Down. Just recently there has been some goverment documents declassified explaining how Portland Down has been randomly spraying civilians in the south west in the 60-70's.
You can quite clearly see how these trails spread out during the day here.