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General accounting policies (Details) £ in Millions | Dec. 31, 2022 GBP (£) | May 01, 2022 | Dec. 31, 2021
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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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