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Tax - Deferred tax reconciliation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of net deferred tax asset |  |
At 1 January | £ (1,951) | £ (836)
Charge/(credit) to income statement | (62) | (236)
(Credit)/charge to other comprehensive income | 258 | (916)
Currency translation and other adjustments | 2 | 37
At 31 December | (1,753) | (1,951)
Pension |  |
Reconciliation of net deferred tax asset |  |
At 1 January | 23 | 24
Charge/(credit) to income statement | 1 | 1
(Credit)/charge to other comprehensive income | (8) | (2)
At 31 December | 16 | 23
Accelerated capital allowances |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (75) | (42)
Charge/(credit) to income statement | (1) | (43)
Currency translation and other adjustments |  | 10
At 31 December | (76) | (75)
Provisions |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (82) | (97)
Charge/(credit) to income statement | 21 | 14
(Credit)/charge to other comprehensive income |  | 1
At 31 December | (61) | (82)
Fair value of financial instruments |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (805) | 248
Charge/(credit) to income statement | 16 | (171)
(Credit)/charge to other comprehensive income | 249 | (913)
Currency translation and other adjustments | 2 | 31
At 31 December | (538) | (805)
Total losses carried forward |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (952) | (899)
Charge/(credit) to income statement | (67) | (51)
Currency translation and other adjustments |  | (2)
At 31 December | (1,019) | (952)
Other |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (60) | (70)
Charge/(credit) to income statement | (32) | 14
(Credit)/charge to other comprehensive income | 17 | (2)
Currency translation and other adjustments |  | (2)
At 31 December | £ (75) | £ (60)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2023-03-23 + Details
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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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81&doctype=Standard -URIDate 2023-03-23 + Details
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