While there are no hard boundaries between Maths Hubs, and geographical areas vary widely, each hub has a catchment containing several hundred schools. In respect of teaching for mastery, each hub now has between 30 and 40 primary schools with current or past direct and funded involvement in Maths Hub projects. But the aspiration, over time, is that half the primary schools in the country participate in that way. So a key leadership and organisational task in each Maths Hub is, initially concentrating on the primary phase, to establish a hub-wide organisational structure in teaching for mastery, creating consistency of practice and opportunity, and gradually drawing in more schools to participate in projects. Here we look at how this is being addressed in the Salop and Herefordshire Maths Hub.