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Cash and cash equivalents (Details) - GBP (£) £ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents.
Restricted cash	£ 13	£ 7
Cash held in countries with foreign exchange regulations	69	66
Cash at bank and in hand	1,713	554
Money market funds	236	52
Short-term bank deposits	221	62
Cash and cash equivalents in the Consolidated Balance Sheet	2,170	668
Bank overdraft	(1,291)	(426)
Cash and cash equivalents in the Consolidated Cash Flow Statement	£ 879	£ 242	£ 551	£ 274

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The amount that has been withdrawn from an account in excess of existing cash balances.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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

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X

- 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]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

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X

- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

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- Definition

Cash held in countries with foreign exchange regulations

+ References

No definition available.

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X

- Definition

Amount of money market funds.

+ References

No definition available.

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