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Tax - Deferred tax reconciliation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of net deferred tax asset |  |
At 1 January | £ (836) | £ (610)
Charge/(credit) to income statement | (236) | (9)
(Credit)/charge to other comprehensive income | (916) | (224)
Currency translation and other adjustments | 37 | 4
At 31 December | (1,951) | (836)
Discontinued operations |  |
Reconciliation of net deferred tax asset |  |
Charge/(credit) to income statement |  | 3
Pension |  |
Reconciliation of net deferred tax asset |  |
At 1 January | 24 | (4)
Charge/(credit) to income statement | 1 | 19
(Credit)/charge to other comprehensive income | (2) | 10
Currency translation and other adjustments |  | (1)
At 31 December | 23 | 24
Accelerated capital allowances |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (42) | (64)
Charge/(credit) to income statement | (43) | 21
Currency translation and other adjustments | 10 | 1
At 31 December | (75) | (42)
Provisions |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (97) | (85)
Charge/(credit) to income statement | 14 | (5)
(Credit)/charge to other comprehensive income | 1 | (7)
At 31 December | (82) | (97)
Fair value of financial instruments |  |
Reconciliation of net deferred tax asset |  |
At 1 January | 248 | 480
Charge/(credit) to income statement | (171) | (10)
(Credit)/charge to other comprehensive income | (913) | (222)
Currency translation and other adjustments | 31 |
At 31 December | (805) | 248
Total losses carried forward |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (899) | (905)
Charge/(credit) to income statement | (51) | (1)
Currency translation and other adjustments | (2) | 4
At 31 December | (952) | (899)
Total losses carried forward | Discontinued operations |  |
Reconciliation of net deferred tax asset |  |
Charge/(credit) to income statement |  | 3
Other |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (70) | (32)
Charge/(credit) to income statement | 14 | (33)
(Credit)/charge to other comprehensive income | (2) | (5)
Currency translation and other adjustments | (2) |
At 31 December | £ (60) | £ (70)

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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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2022-03-24 + Details
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