NHS Clinical Commissioners has published a briefing containing 16 case studies, looking at best practice among CCGs across England. Examples include primary mental health in London, urgent care in Norfolk, frail elderly care pathways in Northumberland, and avoiding unnecessary admissions in Stoke-on-Trent.
Taking the Lead: How clinical commissioning groups are changing the face of the NHS. NHS Clinical Commissioners (2014). http://www.nhscc.org/policy-briefing/taking-the-lead/