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

Statement development

Contents

1. Statement development during Phase 1 A summary of the Phase 1 statement development used in The Gambling Commission's Phase 4 illegal gambling technical report.
2. Statement development during Phase 2 A summary of statement development during Phase 2 used in The Gambling Commission's Phase 4 illegal gambling technical report.
3. The final statements for the GSGB The final statements developed for the Gambling Survey for Great Britain used in The Gambling Commission's Phase 4 illegal gambling technical report.

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Development of the analysis approach - Illegal gambling technical report

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Last updated: 5 November 2026

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