The Dennis Johns Service Group is a forward thinking group of companies providing, Electrical, CCTV and Access Control, installation and maintenance contracting services. We are proud of Dennis Johns Service Group’s history. We began as Dennis Johns Electrical in Hackney 40 years ago. From these beginnings we have evolved and are now proud to be working in partnership with the Commercial and Public Sector, including electrical maintenance throughout the entire Borough of Hackney. Our reputation continues to spread and sees us working with numerous other London Boroughs, Local Authorities and Government Departments. We are the preferred supplier to major names in the construction industry. Our range of technologies has evolved. Our 24/7 CCTV and fibre optic solutions kept the city moving during 2012, and were instrumental resolving the 2011 riots in partnership with the Police. In fact our intelligent security solutions have contributed to a 40% reduction in crime for Hackney residents.