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Related party transactions - Summary of Related Party Transactions Outstanding (Details) - GBP (£) £ in Millions	Jun. 30, 2025	Dec. 31, 2024
Disclosure of transactions between related parties [abstract]
Amounts owed by related parties	£ 109	£ 68
Amounts owed to related parties	£ (124)	£ (104)

X

- Definition

The amounts payable resulting from related party transactions. [Refer: Total for all related parties [member]]

+ References

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2025-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

X

- References

No definition available.

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