This paper seeks to address the question how people go about intercultural differences in an institutional setting which aims to mediate between the socio-legal system and the 'outsiders' of the system, i.e. ordinary citizens, through an investigation of professional interactions between a legal advisor and her clients of Eastern European backgrounds in London. Drawing data from a linguistic ethnography, the analysis foregrounds the practice of resemiotisation and calibration. The second aim is to extend the notion of 'intercultural moments' and to explore its analytical benefits in understanding fleeting and seemingly mundane moments in encounters.