NHS walk-in centres (WICs) were introduced in 2000 to modernise the NHS and increase accessibility to health care. They developed rapidly and have been successfully used by the public. However, little is known about their roles and services, with even less information available on their roles in health promotion and disease prevention. This review appraised the literature on health promotion services provided by WICs and minor injuries/illnesses units. It did not explore provision in other settings or programmes, such as GP surgeries or healthy living centres.