This thesis is a qualitative study of a group of leaders from the Westminster Parliament, the Financial Services Authority and three UK high street banks following the 2008 financial crisis and has been undertaken to further our understanding of interorganisational trust. The study is ethnographically informed, but makes significant use of focus group and interview data. It also uses data collected from Treasury Select Committee meetings and other publications relating to the policy debate following the publication of the draft Independent Commission on Banking Report in April 2011. There is currently a gap in our knowledge about how interpersonal trust relates to trust between organisations. There has been a good deal of empirical work on interpersonal trust between individuals and within organisations; on the other hand, our understanding of interorganisational trust tends to be more theoretical, lacking the same breath of empirical work that has been undertaken on interpersonal trust. This thesis attempts to better understand interorganisational trust building by using what we know from the trust literature. It then proposes a practice-based approach to studying trust-building to address the challenge we face in conceptualising trust coherently at micro and macro levels together, moving our understanding beyond thinking about trust as a construct or as existing at a level. The thesis firstly identifies three practices that help us better understand how trust-building takes place in the complexity of the interorganisational system. The first of these practices is storytelling, the second is curating space, the third is managing knowledge flows. The thesis secondly proposes that understanding individual and organisational actors as occupying a liminal state, existing in a state of being both individual and organisational actors. This allows us to begin to consider trust-building as both a micro and macro concern at once and provides fresh insight into trust-building.