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Deferred income tax - Additional information (Details) - GBP (£) £ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred income tax |  |  |  |
Tax effect from change in tax rate |  | £ 7 | £ 4 | £ 9
Deferred tax liability (asset) |  | £ 468 | 66 | 57
Utilisation period for deferred tax assets |  | 10 years |  |
2023-2039 |  |  |  |
Deferred income tax |  |  |  |
Tax losses for which deferred tax assets not recognized |  | £ 74 | 8 |
Tax losses |  |  |  |
Deferred income tax |  |  |  |
Deferred tax liability (asset) |  | (23) | (14) | £ (18)
Unremitted earnings from subsidiaries |  |  |  |
Deferred income tax |  |  |  |
Deferred tax liability (asset) |  | £ 5 | £ 5 |
UK |  |  |  |
Deferred income tax |  |  |  |
UK corporation tax rate | 25.00% | 19.00% | 19.00% | 19.00%
Tax effect from change in tax rate |  | £ 5 |  |
Tax losses for which deferred tax assets not recognized |  | 120 | £ 41 |
Capital losses carried forward on which no deferred tax asset is recognised |  | 276 | 276 |
UK | Tax losses |  |  |  |
Deferred income tax |  |  |  |
Deferred tax liability (asset) |  | (18) | (12) |
Certain jurisdictions |  |  |  |
Deferred income tax |  |  |  |
Tax losses for which deferred tax assets not recognized |  | £ 230 | £ 82 |

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 + Details
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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 changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_e&doctype=Standard -URIDate 2022-03-24 + Details
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