Academic staff, research assistants, research students and other members of the Institute are entitled and required to deposit digital copies of refereed and other research publications and documents. ...
Exceptionally, material that is to be commercialised, or which can be regarded as confidential, or the publication of which would infringe a legal commitment of the Institute and/or the author, is exempt from inclusion in the repository.
Uploading of items into [the IR] is the responsibility of authors and researchers. It is desirable that items be self-archived. However, this task may be delegated to others or to Library Services.
All deposits of journal articles must comply with Publishers’ policies. ...
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.