During the course of an Initial Teacher Education programme, beginning teachers develop strong professional relationships. This study investigates the nature of these webs of relationships as networks, from a teacher's ego-centric perspective. Three case studies, set within a wider sample of 11 secondary school science teachers leaving one UK university's PostGraduate Certificate in Education, were studied. The focus of the paper is on how the teachers used others to help shape their sense of belonging to this, their new workplace. The paper develops ideas from network theories to argue that membership of the communities are a subset of the professional inter-relationships teachers utilise for their professional development.