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Investments in associated undertakings - Interest (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Investments in associated undertakings |  |  |
Investments in associated undertakings | £ 37 | £ 44 |
Nippon Calmic Limited |  |  |
Investments in associated undertakings |  |  |
Investments in associated undertakings | 25 | 31 | £ 32
Individually immaterial associated undertakings |  |  |
Investments in associated undertakings |  |  |
Investments in associated undertakings | £ 12 | £ 13 | £ 31

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- Definition The amount of investments in associates accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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