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Tax - Deferred tax reconciliation (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of net deferred tax asset |  |
At 1 January | £ (610) | £ (745)
Charge/(credit) to income statement | (9) | (31)
Charge/(credit) to other comprehensive income | (224) | 163
Currency translation and other adjustments | 4 | (6)
At 31 December | (836) | (610)
Discontinued operations |  |
Reconciliation of net deferred tax asset |  |
Charge/(credit) to income statement | 3 | 9
Pension |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (4) | (139)
Charge/(credit) to income statement | 19 | 15
Charge/(credit) to other comprehensive income | 10 | 119
Currency translation and other adjustments | (1) | 1
At 31 December | 24 | (4)
Accelerated capital allowances |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (64) | 172
Charge/(credit) to income statement | 21 | (234)
Currency translation and other adjustments | 1 | (2)
At 31 December | (42) | (64)
Provisions |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (85) | (118)
Charge/(credit) to income statement | (5) | 33
Charge/(credit) to other comprehensive income | (7) |
At 31 December | (97) | (85)
Fair value of financial instruments |  |
Reconciliation of net deferred tax asset |  |
At 1 January | 480 | 315
Charge/(credit) to income statement | (10) | 114
Charge/(credit) to other comprehensive income | (222) | 51
At 31 December | 248 | 480
Total losses carried forward |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (905) | (951)
Charge/(credit) to income statement | (1) | 46
Currency translation and other adjustments | 4 | (9)
At 31 December | (899) | (905)
Total losses carried forward | Discontinued operations |  |
Reconciliation of net deferred tax asset |  |
Charge/(credit) to income statement | 3 | 9
Other |  |
Reconciliation of net deferred tax asset |  |
At 1 January | (32) | (24)
Charge/(credit) to income statement | (33) | (5)
Charge/(credit) to other comprehensive income | (5) | (7)
Currency translation and other adjustments |  | 4
At 31 December | £ (70) | £ (32)

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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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81&doctype=Standard -URIDate 2021-03-24 + Details
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