Having returned from a glorious week away in Crotia and Bosnia (for Pynchon fans: it was "very nice, very nice, very nice indeed"), I have returned to an inbox that features the current state of play with HEFCE's thinking on open access mandates for a post-2014 REF. In order to ensure that I've got it straight in my own head, I thought I'd write a summary post for quick reference. I'm using the PDF version as my reference.
Martin Paul Eve (Sat,) studied this question.