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v3.25.1

Employee benefit obligations - Additional Information (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [line items] |  |  |
Employer contributions (for funded plans) and benefit payments (for unfunded plans) | £ 20 | £ 20 | £ 24
Employer contributions (for funded plans) and benefit payments (for unfunded plans), expected in 2025 | £ 18 |  |
Current pensioners (at age 65) – male |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 21 years 9 months 18 days | 21 years 9 months 18 days |
Current pensioners (at age 65) – female |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 23 years 7 months 6 days | 23 years 7 months 6 days |
Future pensioners (current age 45) – male |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 23 years 4 months 24 days | 23 years 6 months |
Future pensioners (current age 45) – female |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 25 years 1 month 6 days | 25 years 2 months 12 days |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Actuarial assumption of life expectancy after retirements. + References No definition available. + Details
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