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Income tax expense - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income taxes
Effective tax rate	24.20%	22.70%	21.60%
Blended tax rate	25.30%	25.10%	23.70%
Deferred tax recognised on losses	£ 9	£ 3	£ 1
Credited/(charged) to other comprehensive income	£ (6)	£ 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%
Limited number of jurisdictions in which group operates | Maximum
Income taxes
Pillar Two top-up tax charge	£ 1

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph c
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-URIDate 2024-03-27

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- Definition

The amount of current tax expense (income) related to Pillar Two income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
-Paragraph 88B
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-URIDate 2024-03-27

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- Definition

The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit]

+ References

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-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph c
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-URIDate 2024-03-27

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- Definition

Blended tax rate.

+ References

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- Definition

Current income tax relating to components of other comprehensive income

+ References

No definition available.

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