Janneke Adema and Graham Stone have published "The Surge in New University Presses and Academic-Led Publishing: An Overview of a Changing Publishing Ecology in the UK" in LIBER Quarterly.
Here's an excerpt:
This article outlines the rise and development of New University Presses and Academic-Led Presses in the UK or publishing for the UK market. Based on the Jisc research project, Changing publishing ecologies: a landscape study of new university presses and academic-led publishing, commonalities between these two types of presses are identified to better assess their future needs and requirements. Based on this analysis, the article argues for the development of a publishing toolkit, for further research into the creation of a typology of presses and publishing initiatives, and for support with community building to help these initiatives grow and develop further, whilst promoting a more diverse publishing ecology.