Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.


24-hour service (including study clinician)

From UK: 0808 164 4060

From outside the UK: 0044 808 164 4060 or 0044 1865 743 868

For out of hours emergency unblinding requests from clinicians, request to speak to the on-call CTSU clinician.

Please note that there are occasionally delays in answering due to the Covid-19 pandemic affecting the switchboard.


Media enquiries should be directed to the Oxford Population Health Communications Team.



  Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU)

  Richard Doll Building

  University of Oxford

  Roosevelt Drive


  United Kingdom