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BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Hyperinflationary reporting (Details) - GBP (£) £ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES |  |  |
Retained earnings | £ 27,687 |  | £ 27,847
Hyperinflationary reporting, effect on revenue in the period | 7 |  |
Hyperinflationary reporting, effect on operating profit in the period | 2 |  |
Net monetary gain arising from hyperinflationary economies | £ 3 | £ 1 |

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