- Welcome to Halcyon Environmental Halcyon is a Consultancy Services provider, specifically committed to advise and support Industry and Private Sector clients, in achieving and maintaining compliance with existing and forthcoming Environmental and Health and Safety legislation. About Halcyon - Contact Us - Explore our services About Halcyon Halcyon was founded in 1992 and is an active member of ...www.halcyon-env.u-net.com