I will overview the structure of the LSST Science Collaborations and LSST-wide science information about how to get involved. I will describe the LSST:UK Science Working Group structure. For more details and to get involved please sign your name up in the green column (column "I") here https://docs.google.com/spreadsheets/d/1ddpbWj7WI9pVdy9x7vlYFtqqHdghpJu_jqSy3-eH3r0/edit#gid=0 and do contact your relevant representative(s) in column H.