| SP service users | Interviews: Approximately 2 focus groups and 7 in-depth interviews. Purposive sampling, based on ethnicity, gender, age, diabetes risk, participation in SP.
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Clinical data on all Tower Hamlets residents eligible for SP: Clinical measurements (HbA1c). Diagnosis codes (listed in QOF, including hypertension, diabetes, obesity). Disease risk (QRISK2, QDScore, pre-diabetes).
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Sociodemographic data on all Tower Hamlets residents eligible for SP: Age and gender. Ethnicity. Ethnic density of local geography (postcode). Country of birth. First language spoken. Socioeconomic status (index of multiple deprivation, by lower layer super output area).
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| Primary care professionals, including link workers | Interviews: Approximately 2 focus groups and 7 in-depth interviews. Purposive sampling based on professional profile, type of contract, demographic characteristics (age, gender, ethnicity).
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| SP referrers’ quantitative data: |
| VCS organisations | Interviews: Approximately 2 focus groups and 7 in-depth interviews. Purposive sampling based on type of activities, community embeddedness.
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| Observations of SP activities. |
| Key documentation: protocols, referral templates, advertising, web pages, and so on. |
SP providers’ quantitative data: Characteristics of the VCS organisations: available resources, areas of interest. Patients’ attendance frequency.
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| SP service | Overview of the SP service: Existing referral criteria and reasons for referral. Number of referrals per network, surgery, health worker and profession.
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Health economic data, including: Staff contact. Attendance rates. Facility use.
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| Policy makers and public health stakeholders | Interviews: |
| Key documents and policy reports on SP. |