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Investments in associated undertakings - Interest (Details) - GBP (£) £ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments in associated undertakings
Investments in associated undertakings	£ 53	£ 30
Nippon Calmic Limited
Investments in associated undertakings
Investments in associated undertakings	32	29	£ 27
Individually immaterial associated undertakings
Investments in associated undertakings
Investments in associated undertakings	£ 21	£ 1

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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: Associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
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-URIDate 2023-03-23

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