Report

Phase 4: Illegal Gambling Index – Technical Report

The Gambling Commission’s technical report detailing the development of the Illegal Gambling Index.

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Published
5 November 2026

Last updated
5 November 2026 - Changes

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Contents

• Phase 4: Illegal Gambling Index – Technical Report

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• Executive summary
• Introduction
• Overview of approach
• • Timeline of the approach
  • Strengths and limitations
• Statement development
• • Statement development during Phase 1
  • Statement development during Phase 2
  • The final statements for the GSGB
• Development of the analysis approach
• • Introduction to the development of the analysis approach
  • Development of the illegal gambling index
  • Flexing the index for the GSGB
  • Recommendations for future use
• Commission modification of the index
• Final illegal gambling index
• • Final strength ratings for the index
  • Calculating the index
  • Reporting the findings
• Conclusions and next steps
• Appendices
• • Appendix A - Quota and weighting targets for representative online survey
  • Appendix B - Authorship of this report

Introduction to the development of the analysis approach

To support finalisation of these questions and analysis approach, Yonder hosted a refinement workshop with Gambling Commission colleagues. This involved reviewing the Phase 2 quantitative survey responses, and utilised Yonder’s and the Commission’s extensive survey design experience to assess the strength of each illegal gambling statement, how they might be refined for the Gambing Survey for Great Britain (GSGB), and how they could be combined into a single, trackable metric for GSGB stakeholders.

Next section
Development of the illegal gambling index

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Last updated: 5 November 2026

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