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Cash and cash equivalents and total borrowings - Cash Reconciliation (Details) - GBP (£) £ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Cash and cash equivalents and adjusted net debt [Abstract]
Cash and cash equivalents as presented in the consolidated balance sheet	£ 1,437	£ 2,638
Bank overdrafts	(269)	(171)
Cash and cash equivalents as presented in the consolidated cash flow statement	1,168	2,467	£ 1,944	£ 1,860
Borrowings due within one year (excluding bank overdrafts)	(667)	(413)
Borrowings due after one year	(3,845)	(3,744)
Total borrowings (excluding bank overdrafts)	£ (4,512)	£ (4,157)

X

- Definition

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

+ References

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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- Definition

The amount of cash and cash equivalents in the statement of cash flows when different from the amount of cash and cash equivalents in the statement of financial position. [Refer: Cash and cash equivalents]

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The non-current portion of non-current borrowings. [Refer: Borrowings]

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Cash and cash equivalents and adjusted net debt

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Current Borrowings, Excluding Bank Overdrafts

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