Progress will vary significantly across PCNs, with much of this reflecting the local experience of collaborative working across practices, the presence (or not) of effective primary care management support infrastructure via general practice federations, super-partnerships, or clinical commissioning groups, and the nature of underlying pressures facing general practice such as workforce, demand, access and the use of digital technology. This varying progress will likely prove frustrating to NHS England-Improvement, and there may be pressure exerted for PCNs to merge on the basis of assumed economies of scale, to enable more rapid progress. But if such mergers start to happen, and there is the slightest sense of this being mandated by ‘the centre’, PCNs will quickly lose much of the support of local practices, being seen as belonging to ‘them’ (NHS England-Improvement and clinical commissioning groups) rather than ‘us’ (local primary care teams).