This is an edited version of an MSc Dissertation exploring the use of open government data (OGD) from data.gov.uk: taking a theoretical and empirical look at who is using OGD, how it is being used, and what possible implications that has for different models of democratic change and public sector reform. The underlying study adopted a pragmatic mixed-method research design: exploring 55 instances of OGD use in overview and 14 more-detailed embedded cases of data use from data.gov.uk. It also draws upon survey, interview and participant-observation data