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Finance income - Adjusted interest (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance income.
Finance cost	£ 79	£ 34	£ 78
Finance income	(49)	(4)	(6)
Amortisation of discount on legacy provisions	(3)
Gain on hedge accounting recognised in finance income/cost	21	4
Adjusted interest	£ 48	£ 34	£ 37

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 82
-Subparagraph b
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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
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_85&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 24C
-Subparagraph a
-Clause i
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-URIDate 2022-03-24

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- Definition

Amount of amortisation of discount on legacy provisions.

+ References

No definition available.

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- Definition

Represents information pertaining to net amount of adjusted interest payable.

+ References

No definition available.

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