Many health care systems are looking to implement policies to improve productivity and accessibility of health care. In this paper we use data from the English National Health Service to evaluate the effect of introducing new "Community Diagnostic Centres" in 2021 which aim to increase volume, reduce waiting times, and increase accessibility to diagnostic procedures. Our results show an increase in volume of diagnostic procedures associated with the introduction of CDCs at local NHS organisations. We find some evidence the increase is driven by an increase in MRI scans in particular, and this result is larger for CDCs located in more deprived local areas. We find no effect on waiting times which may indicate some demand response to increased availability of tests.