The European Commission has issued Guidelines on Data Management in Horizon 2020 (Oct. 2015) and will be implementing a limited and flexible "pilot action on open access to research data. Participating projects will be required to develop a data management plan, in which they specify which data will be open."
The JOURNAL has to be compliant by making the article freely available through a number of options -- freely accessible on journal Website or placed in a freely accessible repository. Researchers are responsible for ensuring that their journals comply.
Research institutions are expected to provide funds for articles in open access journals if they receive RCUK OA block grants that are created to support their requirements.
RCUK has issued Common Principles on Data Policy that outlines the principles to be followed by the various Councils. "Publicly funded research data are a public good, produced in the public interest, which should be made openly available with as few restrictions as possible in a timely and responsible manner." While data sharing is highly encouraged, it does not appear to be required.