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Income tax expense - Additional Information (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income tax expense |  |  |
Effective tax rate | 21.60% | 19.00% |
Blended tax rate | 24.00% | 24.00% |
Net prior year tax credit | £ 9 | £ 16 | £ 9
Credited to other comprehensive income | £ 11 | £ 2 |

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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 + Details
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- Definition Adjustment in respect of previous periods + References No definition available. + Details
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- Definition Blended tax rate. + References No definition available. + Details
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- Definition Current income tax relating to components of other comprehensive income + References No definition available. + Details
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- Definition No definition available + References No definition available. + Details
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