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Investments in associated undertakings - Interest (Details) - GBP (£) £ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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

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.

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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

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