The American Psychological Association (APA) - publisher of titles such as Journal of Abnormal Psychology and Psychological Bulletin - have developed a Wellcome-Trust compliant author-pays model.
In return for paying an OA fee ($4000) APA will deposit on behalf of the author, the final, published version directly into PMC, where it will be mirrored to UKPMC.
Such papers will be licenced such that anyone may "access, download, copy, display, and redistribute this article or manuscript as well as adapt, translate, or data and text mine the content contained in this document", as long as this is done for non-commercial purposes, and proper attribution is given.
Upon submission to an APA journal, Wellcome-funded authors will be asked to identify their manuscript as being Wellcome Trust funded. If the papers is accepted for publication, Wellcome funded authors should complete this form (pdf) to ensure that APA journals will deposit the manuscript in PMC.
As of April 2009, this author-pays option is only available to Wellcome-funded researchers.