The Wellcome Trust extends open access policy to include scholarly monographs and book chapters
http://www.wellcome.ac.uk/News/Media-office/Press-releases/2013/WTP052746.htm
“The extended policy will become effective for holders of grants awarded after 1 October 2013, and for existing grantholders from October 2014. The new policy does not apply to textbooks, ‘trade’ books, general reference works or works of fiction, or to collections edited but not authored by Trust grantholders. It would not affect, for example, a non-fiction work written by a medical historian aimed at a general audience and published by a commercial publisher.”