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Intangible assets - Other development and research expenditure (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Product development |  |
Disclosure of detailed information about intangible assets |  |
Other development expenditure and all research expenditure | £ 3 | £ 2

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- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 126 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_126&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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