v3.25.4

Operating expenses - Schedule of Performance-Based Compensation Costs (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Performance-based cash awards | £ 225 | £ 162 | £ 169
Performance-based compensation expense |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | 435 | 396 | 440
Performance-based compensation expense deferred until later years |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | 120 | 124 | 130
Awards made in respect of the year ended 31 December | Performance-based compensation expense |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | 343 | 300 | 316
Awards made in respect of the year ended 31 December | Performance-based compensation expense deferred until later years |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | 83 | 90 | 108
Awards made in respect of earlier years | Performance-based compensation expense |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | 92 | 96 | 124
Awards made in respect of earlier years | Performance-based compensation expense deferred until later years |  |  |
OPERATING EXPENSES (Details) - Schedule of Performance-Based Compensation Costs [Line Items] |  |  |
Awards made | £ 37 | £ 34 | £ 22

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