Intervention fidelity assessment: A sub‐study of the Norfolk Diabetes Prevention Study (NDPS). - Withers, Thomas M.; Garner, Nikki J.; Thorley, Chris S.; Kellett, Jo; Price, Lucy; Auckland, Sara; Sheldon, Jo; Howe, Amanda; Pascale, Melanie; Smith, Jane R.; Sampson, Mike J.; Greaves, Colin J. (British Journal of Health Psychology, 2023)