There must be a strong scientific argument or other legitimate rationale for the data to be used for the requested purpose.
No data can be released if this would compromise an ongoing trial. Investigators who have invested time and effort into developing a trial should have a period of exclusivity, before key trial data are made available to other researchers.
The resources required to process requests should not be under-estimated, particularly those needed to prepare data for release. Adequate resources must be available and the scientific aims of the study must justify the use of such resources.
All data exchange must comply with Information Governance and Data Protection Policies in all countries relevant to the disclosure.
All Unit trials must be "discoverable"; they are formally entered on recognised clinical trials registers, such as clinicaltrials.gov and the ISRCTN registry, and listed on the Unit's website. Eligibility criteria for each study and a list of information collected in it are available (sometimes only on request). Timelines to indicate when data might be made available may also be posted, subject to any necessary updating.