Many funders have policies and advice relating to open access:
Research Council UK
Research Councils UK have an RCUK policy on open-access, and have provided the University with funds to help meet article-processing charges (APCs).
HEFCE have issued specific requirements for the post-2014 REF.
The Wellcome Trust
The Wellcome Trust's open-access requirements extend to all research articles, scholarly monographs, and book chapters funded by their research grants. The Wellcome Trust's open-access webpages detail how grant holders can meet their requirements.
The National Institute for Health Research (NIHR) require funded researchers to seek to publish their research outputs in peer-reviewed journals that are compliant with their policy on open access. The NIHR open access webpages detail how grant holders can meet their requirements and apply for funding for open-access publication.
For open FP7 projects Gold Open Access charges can be charged to project grants. Alternatively Researchers publishing in traditional subscription journals can comply through Green open access, by making their papers available through the UWE Bristol Research repository.
The European Community has launched a pilot to fund open-access publications for finalized FP7 projects through the OpenAIRE project. Researchers publishing in fully open access titles, e.g. PLOS, BioMed Central, may be eligible to have their Gold open access fees paid. The project must have closed on or after 1 January 2014 and a maximum of three publications per FP7 project will be funded. A tool is available to check eligibility and apply for funding for APC payments.
Check your funder requirements
Sherpa Fact can be used to check your journal of choice against the open-access policy of many funders.