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Accounting information and policies - Contribution of the Group's Venezuelan and Turkish operations (Details) ₺ in Millions, £ in Millions | 12 Months Ended
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Jun. 30, 2023 GBP (£) Bs. / £ | Jun. 30, 2022 GBP (£) Bs. / £ | Jun. 30, 2022 TRY (₺) | Jun. 30, 2021 GBP (£)
Disclosure of geographical areas [line items] |  |  |  |
Net sales | £ 17,113 | £ 15,452 |  | £ 12,733
Operating loss | 4,632 | 4,409 |  | 3,731
Net cash outflow from operating activities | 4,779 | 5,212 |  | £ 4,857
Net assets | £ 9,292 | 9,514 |  |
Turkey |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Impairment charge |  | 312 | ₺ 3,760 |
Goodwill | Turkey |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Impairment charge |  | 177 | 2,133 |
Brand names | Yenì raki |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Impairment charge |  | £ 135 | ₺ 1,627 |
Turkey |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Movement in price index in hyperinflationary economy | 38.00% | 79.00% | 79.00% |
Venezuela |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Movement in price index in hyperinflationary economy | 382.00% | 268.00% | 268.00% |
Net sales | £ 0 | £ 0 |  |
Operating loss | 0 | (1) |  |
Other finance (charges)/income - hyperinflation adjustment | (2) | 1 |  |
Net cash outflow from operating activities | 0 | 0 |  |
Net assets | 6 | 41 |  |
Venezuela | Reported if in compliance with requirement of IFRS |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Net sales | 9 | 15 |  |
Operating loss | 0 | (1) |  |
Other finance (charges)/income - hyperinflation adjustment | (212) | 157 |  |
Net cash outflow from operating activities | (3) | (5) |  |
Net assets | £ 657 | £ 4,606 |  |
Venezuelan Bolivar Soberano |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Closing foreign exchange rate | Bs. / £ | 3,807 | 759 |  |
Venezuelan Bolivar Soberano | Reported if in compliance with requirement of IFRS |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Closing foreign exchange rate | Bs. / £ | 36 | 7 |  |

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