Having deployed over 42 Use cases across 5 boroughs, with trials above and underground and in peoples homes comprising c2600 sensors we have learnt a lot. We can speak about the sheer importance of Officer engagement and how it can literally make or break a trial. Our experience with suppliers, the public, councillors and when the public take matters into their own hands and the results. In summary we can talk about sensors that have saved lives, know the Air Quality outside primary schools and exactly how many people walk past that school therefore breathing in that air. Take aways are the whats worked well, where to tread very carefully and our successes...most noticeably saving 4 lives to date. Underpinning this needs to be the IoT Data Platform as it removes the tricky situation of silo'd data and too many passwords / officers getting confused.