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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).

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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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
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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
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-IssueDate 2021-01-01
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-Subparagraph c
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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