This paper's focus is on an alliance of schools in England that came together as part of the National Teaching Schools initiative. Drawing on interviews from Head Teachers within the alliance, the paper explores issues of school collaboration from a premise that such collaboration is paramount to school improvement within the current climate of increased school autonomy and increasingly rigid accountabilities. The Head Teachers highlight key factors that supported effective school-to-school collaborations associated with sharing their expertise and fostering active and cooperative connections. They also, however, highlight factors that undermined genuine collaboration associated with a prioritising of the performative demands and economic imperatives of the audit culture. The impact of this prioritising should, it is argued, be considered in any analysis of school collectives within the current English education system--particularly given their proliferation and the responsibility placed on them in terms of school improvement.