Corrections log

    We do not silently alter historical results. Whenever a published index figure or ranking is corrected, we record it here — showing the index affected, the original publication date, the correction date, what changed, why it changed, and whether rankings or conclusions were affected.

    See also our methodology and version history.

    • Fixed Tariff Availability Index

      Rankings affected

      Originally published 5 July 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-07 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Standing Charge Tracker

      Rankings affected

      Originally published 5 July 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-07 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Supplier Trust Index

      Rankings affected

      Originally published 5 July 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-07 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Heat Pump Running Cost Index

      Rankings affected

      Originally published 5 July 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-07 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Home Energy Score

      Rankings affected

      Originally published 5 July 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-07 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Fixed Tariff Availability Index

      Rankings affected

      Originally published 3 August 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-08 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Standing Charge Tracker

      Rankings affected

      Originally published 3 August 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-08 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Supplier Trust Index

      Rankings affected

      Originally published 3 August 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-08 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Heat Pump Running Cost Index

      Rankings affected

      Originally published 3 August 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-08 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Home Energy Score

      Rankings affected

      Originally published 3 August 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-08 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Fixed Tariff Availability Index

      Rankings affected

      Originally published 5 September 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-09 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Standing Charge Tracker

      Rankings affected

      Originally published 5 September 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-09 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Supplier Trust Index

      Rankings affected

      Originally published 5 September 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-09 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Heat Pump Running Cost Index

      Rankings affected

      Originally published 5 September 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-09 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

    • Home Energy Score

      Rankings affected

      Originally published 5 September 2026 · corrected 15 September 2026

      What changed: Withdrew the 2026-09 reporting period, including its headline score, averages and data rows, from publication.

      Why: These values were generated by a scheduled job that copied the previous period and adjusted every number by a small automatic amount. They had no source data, no reproducible calculation and no human check, so they could not be supported. The last genuinely published observation remains available with its own date. The job no longer creates or alters figures.

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