The UK CHIC study welcomes proposals for research from existing and potential new collaborators at any time. Any bona fide researcher may submit a proposal: either for novel scientific research using UK CHIC data, or for verification and replication of published analyses of UK CHIC data. All research proposals are subject to review by the UK CHIC Steering Committee for evaluation of the scientific value, relevance to the study, design and feasibility, statistical power and overlap with existing projects. If the proposal is for verification/replication of a published analysis, data with then be made available. A decision on whether a proposal has been approved is normally made within one month of its submission. Support for statistical analyses may be available from the study team.