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Intangible assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Intangible assets |
Schedule of Intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022
​ |  | Goodwill |  | Other (1) |  | Total |  | Goodwill |  | Other (1) |  | Total
Cost | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 1 January |  | 9,931 | ​ | 3,763 | ​ | 13,694 |  | 9,939 | ​ | 3,050 | ​ | 12,989
Currency translation and other adjustments |  | — |  | — |  | — |  | (8) |  | (3) |  | (11)
Acquisitions of companies and businesses | ​ | 159 | ​ | 37 | ​ | 196 | ​ | — | ​ | — | ​ | —
Additions |  | — |  | 762 |  | 762 |  | — |  | 743 |  | 743
Disposals and write-off of fully amortised assets |  | — |  | (115) |  | (115) |  | — |  | (27) |  | (27)
At 31 December |  | 10,090 | ​ | 4,447 | ​ | 14,537 |  | 9,931 | ​ | 3,763 | ​ | 13,694
​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
Accumulated amortisation and impairment |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
At 1 January |  | 4,409 | ​ | 2,169 | ​ | 6,578 |  | 4,417 | ​ | 1,849 | ​ | 6,266
Currency translation and other adjustments |  | — |  | — |  | — |  | (8) |  | (4) |  | (12)
Disposals and write-off of fully amortised assets |  | — |  | (116) |  | (116) |  | — |  | (17) |  | (17)
Impairment of intangible assets |  | 1 |  | 22 |  | 23 |  | — |  | — |  | —
Amortisation charge for the year | ​ | — | ​ | 438 | ​ | 438 | ​ | — | ​ | 341 | ​ | 341
At 31 December |  | 4,410 |  | 2,513 |  | 6,923 |  | 4,409 |  | 2,169 |  | 6,578
Net book value at 31 December |  | 5,680 |  | 1,934 |  | 7,614 |  | 5,522 |  | 1,594 |  | 7,116
​
(1) | Principally consists of internally generated software.

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- Definition The disclosure of intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_10_e&doctype=Standard -URIDate 2023-03-23 + Details
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