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Finance income (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance income.
Bank interest received	£ 25	£ 5	£ 1
Fair value gain on hedge ineffectiveness	1	22
Foreign exchange gain on translation of foreign assets/liabilities	11
Hyperinflation accounting adjustment	11	22	3
Total finance income	£ 48	£ 49	£ 4

X

- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2023-01-01
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X

- Definition

The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2023-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The gains (losses) representing the difference resulting from the restatement of non-monetary assets, owners' equity and items in the statement of comprehensive income and the adjustment of index linked assets and liabilities in hyperinflationary reporting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 29
-IssueDate 2023-01-01
-Paragraph 9
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- Definition

The amount of interest income on deposits. [Refer: Interest income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
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- Definition

Fair value gain on hedge ineffectiveness

+ References

No definition available.

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No definition available.

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