Great observation and documentation @samstonehill. Interestingly, I have been seeing Chemtrails in eastern India ( Kolkata) for the first time in 2017/18..not very regular, may be being sprawed at night to prevent public viewing.
I have been researching geoengineering for some time and was made aware of other components of the same. I recently wrote this piece on Geoengineering focussing on a lesser known fundamental principle of geoengineering - Using Cooling towers/ WSACs to generate the enormous amount of water vapor to create cloud systems, hurricanes and flash floods. Hope you get the chance to take a look and give me some feedback - https://steemit.com/informationwar/@amit86/series-or-geoengineering-the-not-so-cool-cooling-towers-or-post-2