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Revenue recognition and operating segments - Analysis of revenue by type (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue | £ 3,714 | £ 2,957 | £ 2,803
Recognised over time | Contract service revenue |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue | 2,610 | 2,009 | 1,878
Recognised at a point in time | Job work |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue | 724 | 641 | 651
Recognised at a point in time | Sales of goods |  |  |
Disclosure of disaggregation of revenue from contracts with customers |  |  |
Revenue | £ 380 | £ 307 | £ 274

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard -URIDate 2023-03-23 + Details
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