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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The amount of current trade receivables. [Refer: Trade receivables]

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

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Percentage of cash and cash equivalents held with banks rated A-/A3 or better.

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Financial instruments - Credit risk - Additional information (Details) - GBP (£) £ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments
Cash and cash equivalents	£ 155	£ 334	£ 113	£ 88
Percentage of cash and cash equivalents held with banks rated A-/A3 or better	91.00%	96.00%
Trade receivables	£ 2,025	£ 2,075
Total past due
Disclosure of detailed information about financial instruments
Trade receivables	480	449	305
Up to one month
Disclosure of detailed information about financial instruments
Trade receivables	259	265	156
Two to three months
Disclosure of detailed information about financial instruments
Trade receivables	130	115	96
Four to six months
Disclosure of detailed information about financial instruments
Trade receivables	56	46	35
Greater than six months
Disclosure of detailed information about financial instruments
Trade receivables	£ 35	£ 23	£ 18