A key part of understanding the dynamics of the socio-technical is to focus on the relationships between an object and surrounding actors, including, importantly for our analysis, ‘the public’ as users, consumers, customers etc. (Akrich 1992). Technology and system developers ascribe imagined roles for actors which they may or may not take up and spaces in which they may or may not operate (Bijker 1995). These actors in turn can devise their own roles and alternative meanings for objects that have interpretive flexibility in how they are understood and represented (Law and Callon 1987). Understanding how changes in socio-technical systems take place therefore requires an analysis that recognises the interactive roles of multiple actors at different scales of activity (Elzen and Wieczorek 2005), the structural factors and distributions of