v3.25.4

Retirement benefit obligations - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Discount rates (in percent) | 5.57% | 5.55%
Retail Price Index (RPI) |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Inflation (in percent) | 2.65% | 2.97%
Consumer Price Index (CPI) |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Inflation (in percent) | 2.13% | 2.52%
Increase of 0.25% | Actuarial assumption of expected rates of inflation |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible increase in actuarial assumption | £ 27 | £ 28
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (455) | (484)
Increase of 0.25% | Actuarial assumption of discount rates |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible increase in actuarial assumption | (46) | (51)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 659 | 718
Decrease of 0.25% | Actuarial assumption of expected rates of inflation |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible decrease in actuarial assumption | (25) | (27)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 433 | 467
Decrease of 0.25% | Actuarial assumption of discount rates |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible decrease in actuarial assumption | 45 | 49
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (700) | (757)
Increase of one year | Expected life expectancy of members: |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible increase in actuarial assumption | 45 | 46
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (802) | (806)
Decrease of one year | Expected life expectancy of members: |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Schedule of Possible Alternative Assumptions Used in Valuations of Defined Benefit Pension Schemes [Line Items] |  |
Increase (decrease) in income statement charge due to reasonably possible decrease in actuarial assumption | (47) | (47)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | £ 827 | £ 830

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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