v3.25.4

Retirement benefit obligations - Schedule of Net Retirement Benefits Amounts Recognized in Balance Sheet (Details) - GBP (£) £ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items] |  |  |
Defined benefit asset | £ 2,575 | £ 2,906 |
Defined benefit pension schemes |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items] |  |  |
Defined benefit asset | 2,612 | 2,945 | £ 3,532
Present value of funded obligations |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items] |  |  |
Defined benefit asset | (26,571) | (27,118) | (30,201)
Fair value of scheme assets |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Retirement Benefits Amounts Recognized in Balance Sheet [Line Items] |  |  |
Defined benefit asset | £ 29,183 | £ 30,063 | £ 33,733

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