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Finance income (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance income.
Bank interest received	£ 5	£ 1	£ 2
Interest receivable on foreign exchange swaps			3
Fair value gain on hedge ineffectiveness	22
Hyperinflation accounting adjustment	22	3
Interest on net defined benefit asset	0	0	1
Total finance income	£ 49	£ 4	£ 6

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
-Number 1
-IssueDate 2022-03-24
-Paragraph 85
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-URIDate 2022-03-24

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X

- 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 2022-03-24
-Paragraph 9
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=29&code=ifrs-tx-2022-en-r&anchor=para_9&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

The amount of interest income arising from defined benefit plans. [Refer: Interest income; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 135
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard
-URIDate 2022-03-24

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X

- 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 2022-03-24
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

Fair value gain on hedge ineffectiveness

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Amount of income from interest receivable on foreign exchange swaps.

+ References

No definition available.

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