Vitae, the research careers organisation, has published a briefing for those involved in the career development of researchers on how to make submissions to the Research Excellence Framework.
This, along with a shorter summary of the main points, aims to help those responsible for preparing submissions and to highlight the importance of evidence of careers development activities to meet certain REF criteria.
Further details: http://www.vitae.ac.uk/policy-practice/375-599821/Vitae-has-published-two-briefings-for-institutions-submitting-to-REF-2014.html