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Leases - Summary of Breakdown of Lease Expense (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Leases [Line Items]
Depreciation of right-of-use assets	£ (213)	£ (257)	£ (262)
Impairment charges	(1)	(129)	(34)
Short-term lease expense	(21)	(22)	(20)
Low-value lease expense	(2)	(3)	(2)
Variable lease expense	(48)	(45)	(57)
Sublease income	20	17	19
Charge to operating profit	(265)	(439)	(356)
Interest expense related to lease liabilities	(98)	(106)	(96)
Charge to profit before taxation for leases	(363)	(545)	(452)
Land and buildings
Disclosure Of Leases [Line Items]
Depreciation of right-of-use assets	(197)	(236)	(245)
Impairment charges	(1)	(129)
Interest expense related to lease liabilities	(95)	(103)
Plant and machinery
Disclosure Of Leases [Line Items]
Depreciation of right-of-use assets	(16)	(21)	£ (17)
Impairment charges	0	0
Interest expense related to lease liabilities	£ (3)	£ (3)

X

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph a
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-URIDate 2024-03-27

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- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_d&doctype=Standard
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- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

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-Name IFRS
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-IssueDate 2024-01-01
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- Definition

The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_e&doctype=Standard
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- Definition

The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets]

+ References

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-Paragraph 53
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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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-IssueDate 2024-01-01
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- Definition

Charge to operating profit for lease expense.

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Charge to profit before taxation for leases.

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- Definition

Disclosure Of Leases.

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- Definition

Impairment of right of use assets.

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No definition available.

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