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Income tax expense - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income taxes
Effective tax rate	22.70%	21.60%
Blended tax rate	25.10%	23.70%
Net prior year tax credit	£ 12	£ 9	£ 16
Credited to other comprehensive income	£ 6	£ 11
Most of jurisdictions in which group operates | Minimum
Income taxes
Effective tax rate	15.00%
Limited number of jurisdictions in which group operates
Income taxes
Effective tax rate	15.00%

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- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2023-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2023-03-23

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- Definition

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+ References

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- Definition

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+ References

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