Simon spent almost 20 years in the CRE stack-emission monitoring team. One of his principal duties was the inspection of stack-emission monitoring facilities as part of site reviews to pave the way for subsequent practical emission monitoring work. The number of sites visited in the UK and overseas runs into hundreds. This work culminated in a large project carried out on behalf of the Environment Agency to assess the suitability of stack-emission monitoring facilities and degree of compliance with published guidance from a range of IPC sites.