According to the report commissioned by Universities UK Open Access Coordination Group the share of UK research which is freely available is increasing at a considerable rate. 37% of UK outputs are available via open access to public view either through Gold or Green OA within 12 months. The trend of UK-authored articles published open access went up from 12% in 2012 to 30% in 2016, an annual growth rate of over 30% sustained throughout the period.
Reference Link: http://www.stm-publishing.com/37-of-uk-research-outputs-freely-available-immediately-at-the-time-of-publication-says-new-report/