v3.25.4

Retirement benefit obligations - Schedule of Pension Scheme's Pooled Investment Vehicles (Details) - GBP (£) £ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | £ 6,617 | £ 8,028
Alternative credit funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 1,138 | 1,793
Bond and debt funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 276 | 449
Equity funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 1,644 | 1,553
Hedge and mutual funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 0 | 709
Infrastructure funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 1,012 | 1,059
Liquidity funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 1,702 | 1,449
Property funds |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | 817 | 992
Other |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Pension Scheme's Pooled Investment Vehicles [Line Items] |  |
Pooled investment vehicles | £ 28 | £ 24

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- Definition The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]; Investment funds [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 142 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_142_f&doctype=Standard -URIDate 2025-03-27 + Details
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