The Research Information Network has released Access to Scholarly Content: Gaps and Barriers.
Here's an excerpt:
The overall aim of this study is to investigate and quantify the extent to which members of different communities in the UK can gain ready access to formally-published scholarly literature, in particular journal articles and conference proceedings. . . .
Much of the information presented here is based on an online survey of researchers and knowledge workers from UK universities and colleges, medical schools and health providers, industry and commerce, and research institutes. . . .
Other information in this report comes from a detailed analysis of the literature and secondary data analysis of the Labour Force Survey in an attempt to quantify the size of the UK professional knowledge worker sector.