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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Intangible assets |
Schedule of Intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023
​ |  | Goodwill |  | Other (1) |  | Total |  | Goodwill |  | Other (1) |  | Total
Cost | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m | ​ | £m
At 1 January |  | 10,090 | ​ | 4,447 | ​ | 14,537 |  | 9,931 | ​ | 3,763 | ​ | 13,694
Currency translation and other adjustments |  | (4) |  | (65) |  | (69) |  | — |  | — |  | —
Acquisitions of companies and businesses | ​ | — | ​ | — | ​ | — | ​ | 159 | ​ | 37 | ​ | 196
Additions |  | — |  | 614 |  | 614 |  | — |  | 762 |  | 762
Disposals and write-off of fully amortised assets |  | — |  | (214) |  | (214) |  | — |  | (115) |  | (115)
At 31 December |  | 10,086 | ​ | 4,782 | ​ | 14,868 |  | 10,090 | ​ | 4,447 | ​ | 14,537
​ |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
Accumulated amortisation and impairment |  | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
At 1 January |  | 4,410 | ​ | 2,513 | ​ | 6,923 |  | 4,409 | ​ | 2,169 | ​ | 6,578
Currency translation and other adjustments |  | — |  | (24) |  | (24) |  | — |  | — |  | —
Disposals and write-off of fully amortised assets |  | — |  | (201) |  | (201) |  | — |  | (116) |  | (116)
Impairment of intangible assets |  | 1 |  | 20 |  | 21 |  | 1 |  | 22 |  | 23
Amortisation charge for the year | ​ | — | ​ | 561 | ​ | 561 | ​ | — | ​ | 438 | ​ | 438
At 31 December |  | 4,411 |  | 2,869 |  | 7,280 |  | 4,410 |  | 2,513 |  | 6,923
Net book value at 31 December |  | 5,675 |  | 1,913 |  | 7,588 |  | 5,680 |  | 1,934 |  | 7,614
​
(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 2024-01-01 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_10_e&doctype=Standard -URIDate 2024-03-27 + Details
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