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Intangible assets - Schedule of Goodwill attributed to cash-generating units (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | £ 2,227 | £ 2,287
United States |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | 767 | 773
Turkey |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | 216 | 255
Greater China |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | 124 | 141
India |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | 673 | 747
Mexico |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | 161 | 142
Other cash-generating units |  |
Disclosure of information for cash-generating units [line items] |  |
Goodwill attributed to cash-generating unit | £ 286 | £ 229

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2022-03-24 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2022-en-r&anchor=para_134_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2022-03-24 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2022-en-r&anchor=para_135_a&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2022-03-24 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_c&doctype=Standard -URIDate 2022-03-24 + Details
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