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General accounting policies (Details) £ in Millions	Dec. 31, 2022 GBP (£)	May 01, 2022	Dec. 31, 2021
Disclosure of geographical areas
Assumed revenue decline for downside scenario	20.00%
Cash loss for downside scenario	£ 200
Argentina
Disclosure of geographical areas
Level of price index	1,134.59	716.94
Lebanon
Disclosure of geographical areas
Level of price index	2,045.46		921.40
Turkey
Disclosure of geographical areas
Level of price index	1,128.45		686.95

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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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The value of the level of the general price index used to restate financial statement information of an entity whose functional currency is the currency of a hyperinflationary economy.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 29
-IssueDate 2023-01-01
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Assumed cash loss for downside scenario.

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