Investigating the nature and quality of locally commissioned evaluations of the NHS Vanguard programme: an evidence synthesis.

Significant investment was made in independent local evaluations of the Vanguard programme by NHS England. This synthesis represents the only comprehensive attempt to capture methodological learning and may serve as a key resource for researchers and policy-makers seeking to understand investigating large-scale system change, both within the NHS and internationally. PROSPERO (Registration number: CRD42017069282).