As an Assembly Member, Lynch was a member of the London Fire and Emergency Planning Authority (LFEPA), the Metropolitan Police Authority, the Culture, Sport and Tourism Committee, the Planning and Spatial Development Committee, the Health Committee and the Standards Committee (of which he was Chair). He focused on health issues, the homeless, GM crops, fluoride, the aged, disability issues and animal rights. He campaigned successfully to save Cricklewood Homeless Centre and improved the then fledgling Patients Forum of the London Ambulance Service. He organised conferences in City Hall on GM Crops and Non-animal Medical Research. He wrote four papers - "Where Have All the Local Shops Gone?", "Plastic not Fantastic" (against plastic bag waste), "Toilets Going to Waste" (on the decline in public toilets) and "Keep Off the Grass - the Loss of London's Playing Fields". In addition, he asked 157 formal questions to the Mayor on a wide range of issues.