TALLYCAT01 G01: CALCULATIONS AND SOURCE CELLS
Evidence checked and source files retrieved: 8 October 2026

SCOPE
Published aggregate table arithmetic. No record-level dataset, filters, joins, imputations or individual case analysis. Round final percentages to the nearest whole number; keep full precision before rounding. An arrest count is not attacks, convictions or necessarily unique people.

ARREST SERIES
Original release: https://www.gov.uk/government/statistics/operation-of-police-powers-under-tact-2000-to-june-2026
Original annual tables: https://assets.publishing.service.gov.uk/media/6ac65d8bb016250bca0139b7/operation-police-powers-terrorism-jun2026-annual-tables.ods
Version: annual tables to June 2026, published 8 October 2026.
Worksheet: A_A_01. Unit: recorded terrorism-related arrests.
Geography: Great Britain (England, Wales and Scotland), excluding Northern Ireland.
Previous period: 1 July 2024 to 30 June 2025, column Y.
Current period: 1 July 2025 to 30 June 2026, column Z.

1. ALL ARRESTS
Table A.01a: Y15 = 234; Z15 = 3,867.
Numerator (change): 3,867 - 234 = 3,633.
Denominator: previous total of 234.
(3,867 - 234) / 234 * 100 = 1,552.5641025641%.
Rounded result: 1,553% increase.

2. LINKED TO SUPPORTING PALESTINE ACTION
Table A.01b: Z25 = 3,630.
Numerator: 3,630; denominator: current all-arrest total 3,867 (A.01a, Z15).
3,630 / 3,867 * 100 = 93.8712179984%.
Rounded result: 94% of all current arrests.

3. NOT LINKED TO SUPPORTING PALESTINE ACTION
Table A.01c: Y35 = 234; Z35 = 237.
Numerator (change): 237 - 234 = 3; denominator: previous subgroup total 234.
(237 - 234) / 234 * 100 = 1.2820512821%.
Rounded result: 1% increase.
Reconciliation: 3,630 + 237 = 3,867.
This is the Home Office's published subgroup, not an estimate of a world without proscription.

SEPARATE HATE-CRIME SERIES
Original tables: https://assets.publishing.service.gov.uk/media/6ac510c0a4449136071df94d/hate-crime-england-and-wales-2025-to-2026-data-tables.ods
Version: 2025 to 2026 data tables, published 8 October 2026.
Worksheet: 2. Unit: police-recorded offences.
Geography: England and Wales.
Previous period: 1 April 2024 to 31 March 2025, column B.
Current period: 1 April 2025 to 31 March 2026, column C.
All: B23 = 137,560; C23 = 146,825; change = 9,265.
(146,825 - 137,560) / 137,560 * 100 = 6.7352428031%; rounded 7%.
Race: B17 = 98,890; C17 = 107,926; change = 9,036.
(107,926 - 98,890) / 98,890 * 100 = 9.1374254222%; rounded 9%.
Religion: B18 = 10,067; C18 = 11,419; change = 1,352.
(11,419 - 10,067) / 10,067 * 100 = 13.4300188735%; rounded 13%.
Do not combine this series with the arrest totals or infer a causal link. Reporting and recording affect police-recorded figures.

PRESERVED SOURCE FILE HASHES (SHA-256)
Annual terrorism ODS: b227f635fb85f11a3d10521fb20939ca5fa95a068c098c706e0565bb3e14e769
Hate-crime data ODS: 4f20854edb63ed79bf9da29c0b3d97391d233e168d2f87c3708e796c67736116
Hashes identify the exact source bytes used. Later publisher revisions may differ.

Contains public sector information licensed under the Open Government Licence v3.0.
https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/
Research and production assisted by AI.