The document summarizes a review of informal science learning in the UK that was conducted in two parts. The first part involved stakeholder interviews, case studies, and family research conducted by GHK. The second part involved modeling the contributions of informal education resources to UK science learning conducted by researchers from Stanford University, Oregon State University, and elsewhere. It identifies the top ten sectors contributing to informal science learning as science museums, electronic media, science and discovery centers, general museums, both formal and informal learning, broadcast media, secondary schools, outreach schemes, and outdoor environments.