Joint Research Centre (JRC) of the European Commission. There a colleague shared with me the JRC's guidelines for integrity in scientific support activities -- "Robust Science for Policy Making: A guideline towards integrity and veracity in scientific support and advice."
The document offers an excellent statement of values and principles which underlie the JRC's mission to serve and an "in-house science service" to the European Commission. The document is not otherwise available online, and with permission, I share it here in PDF.
If you or your organization is in the business of providing scientific advice to policy makers, how does your organization's position on scientific integrity stack up?