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Memorandum items - Contractual obligations of future (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure Of Capital Commitments [Line Items] |  |  |
Capital expenditure on property, plant and equipment | £ 16 | £ 15 | [1]
Contracts to purchase goods or services | 682 | 729 | [1]
Total capital commitments | 698 | 744 | [1]
Not later than one year [member] |  |  |
Disclosure Of Capital Commitments [Line Items] |  |  |
Contracts to purchase goods or services | £ 301 | £ 267 |
[1] | Of which due within 1 year: £301 million (2020 - £267 million).

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- Definition The amount of future capital expenditures that the entity is committed to make. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 74 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_74_c&doctype=Standard -URIDate 2021-03-24 + Details
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