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Segmental information - Other information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software £ 1,180 £ 1,097 £ 626
Depreciation and intangible asset amortisation (496) (489) (447)
Exceptional impairment of tangible assets (72) (3)  
Exceptional impairment of intangible assets (498) (336)  
Operating segments | North America      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 197 230 153
Depreciation and intangible asset amortisation (95) (80) (76)
Exceptional impairment of tangible assets (52) 0  
Exceptional impairment of intangible assets (29) 0  
Operating segments | Europe      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 209 187 23
Depreciation and intangible asset amortisation (98) (93) (31)
Exceptional impairment of tangible assets 2 (3)  
Exceptional impairment of intangible assets (25) (96)  
Operating segments | Asia Pacific      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 166 146 56
Depreciation and intangible asset amortisation (61) (93) (60)
Exceptional impairment of tangible assets (22) 0  
Exceptional impairment of intangible assets (444) (240)  
Operating segments | Latin America and Caribbean      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 121 128 20
Depreciation and intangible asset amortisation (18) (16) (16)
Exceptional impairment of tangible assets 0 0  
Exceptional impairment of intangible assets 0 0  
Operating segments | Africa      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 126 139 125
Depreciation and intangible asset amortisation (80) (81) (79)
Exceptional impairment of tangible assets 0 0  
Exceptional impairment of intangible assets 0 0  
Operating segments | SC&P      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 356 256 125
Depreciation and intangible asset amortisation (134) (116) (126)
Exceptional impairment of tangible assets 0 0  
Exceptional impairment of intangible assets 0 0  
Corporate and other      
Disclosure of operating segments [line items]      
Purchase of property, plant and equipment and computer software 5 11 124
Depreciation and intangible asset amortisation (10) (10) £ (59)
Exceptional impairment of tangible assets 0 0  
Exceptional impairment of intangible assets £ 0 £ 0