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Deferred income tax (Tables) | 12 Months Ended
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Dec. 31, 2022
Deferred income tax |
Summary of movement on the deferred income tax account, major components of deferred tax assets and liabilities at the year end and their changes during the year | ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
​ | ​ | £m | ​ | £m
At 1 January |  | (66) |  | (57)
Exchange differences |  | 27 |  | 2
Acquisition of companies and businesses |  | (446) |  | (8)
Credited to the income statement |  | 14 |  | (8)
Credited to other comprehensive income | ​ | 5 | ​ | —
Charged to equity |  | (2) |  | 5
At 31 December |  | (468) |  | (66)
Deferred taxation has been presented on the balance sheet as follows: |  |  |  |
Deferred tax asset within non-current assets |  | 43 |  | 42
Deferred tax liability within non-current liabilities |  | (511) |  | (108)
​ |  | (468) |  | (66)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Customer |  | Accelerated |  | ​ |  | ​ |  | ​ |  | ​ |  | ​ |  | ​
​ | ​ | lists/ | ​ | tax | ​ | ​ | ​ | IFRS 15 | ​ | Tax | ​ | Share-based | ​ | ​ | ​ | ​
​ | ​ | intangibles | ​ | depreciation | ​ | Provisions | ​ | Contracts | ​ | losses | ​ | payments | ​ | Other1 | ​ | Total
​ | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 1 January 2021 | ​ | 76 | ​ | 44 | ​ | (45) | ​ | 8 | ​ | (18) | ​ | (9) | ​ | 1 | ​ | 57
Exchange differences |  | — |  | (1) |  | (1) |  | — |  | — |  | — |  | — |  | (2)
Recognised in income statement |  | 1 |  | 7 |  | (7) |  | 1 |  | 4 |  | (1) |  | 3 |  | 8
Recognised in equity |  | — |  | — |  | — |  | — |  | — |  | (5) |  | — |  | (5)
Acquired in business combinations |  | 7 |  | — |  | 1 |  | — |  | — |  | — |  | — |  | 8
At 31 December 2021 |  | 84 |  | 50 |  | (52) |  | 9 |  | (14) |  | (15) |  | 4 |  | 66
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At 1 January 2022 |  | 84 |  | 50 |  | (52) |  | 9 |  | (14) |  | (15) |  | 4 |  | 66
Exchange differences | ​ | (32) | ​ | — | ​ | 8 | ​ | (2) | ​ | — | ​ | — | ​ | (1) | ​ | (27)
Recognised in income statement | ​ | (1) | ​ | (4) | ​ | (4) | ​ | 2 | ​ | (2) | ​ | (3) | ​ | (2) | ​ | (14)
Recognised in other comprehensive income |  | — | ​ | — | ​ | — | ​ | — | ​ | (4) | ​ | — | ​ | (1) | ​ | (5)
Recognised in equity |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 2 | ​ | — | ​ | 2
Acquired in business combinations |  | 519 | ​ | 29 | ​ | (123) | ​ | 24 | ​ | (3) | ​ | — | ​ | — | ​ | 446
At 31 December 2022 |  | 570 | ​ | 75 | ​ | (171) | ​ | 33 | ​ | (23) | ​ | (16) | ​ | — | ​ | 468
1. | Included within other deferred tax assets/liabilities are retirement benefits and unremitted earnings from subsidiaries.

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- Definition The disclosure of detailed information pertaining to reconciliation of changes in deferred tax liability (asset). + References No definition available. + Details
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