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Taxation - Change in deferred tax assets and liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance £ (2,205) £ (1,845)
Exchange differences 134 (153)
Recognised in income statement 74 21
Reclassification   35
Recognised in other comprehensive loss and equity 66 (207)
Tax rate change – recognised in income statement (11) (3)
Tax rate change – recognised in other comprehensive loss and equity   (20)
Acquisition of subsidiaries (71) (31)
Transfer from asset held for sale (34)  
Sale of businesses 5 (2)
Ending balance (2,042) (2,205)
Tax losses    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 63 57
Exchange differences 1 3
Recognised in income statement (15) 2
Reclassification   0
Recognised in other comprehensive loss and equity 0 0
Tax rate change – recognised in income statement 0 1
Tax rate change – recognised in other comprehensive loss and equity   0
Acquisition of subsidiaries 0 0
Transfer from asset held for sale 0  
Sale of businesses 0 0
Ending balance 49 63
Other temporary differences    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 353 244
Exchange differences (10) 17
Recognised in income statement 24 74
Reclassification   (7)
Recognised in other comprehensive loss and equity (50) 20
Tax rate change – recognised in income statement 3 0
Tax rate change – recognised in other comprehensive loss and equity   2
Acquisition of subsidiaries 0 0
Transfer from asset held for sale 5  
Sale of businesses (4) 3
Ending balance 321 353
Property, plant and equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (468) (381)
Exchange differences 33 (21)
Recognised in income statement (30) (42)
Reclassification   2
Recognised in other comprehensive loss and equity (6) (20)
Tax rate change – recognised in income statement (1) (1)
Tax rate change – recognised in other comprehensive loss and equity   0
Acquisition of subsidiaries 0 0
Transfer from asset held for sale (2)  
Sale of businesses 10 (5)
Ending balance (464) (468)
Intangible assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (1,892) (1,636)
Exchange differences 113 (155)
Recognised in income statement 93 (3)
Reclassification   40
Recognised in other comprehensive loss and equity (30) (104)
Tax rate change – recognised in income statement (12) (3)
Tax rate change – recognised in other comprehensive loss and equity   0
Acquisition of subsidiaries (71) (31)
Transfer from asset held for sale (37)  
Sale of businesses 0 0
Ending balance (1,836) (1,892)
Post employment plan    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (261) (129)
Exchange differences (3) 3
Recognised in income statement 2 (10)
Reclassification   0
Recognised in other comprehensive loss and equity 152 (103)
Tax rate change – recognised in income statement (1) 0
Tax rate change – recognised in other comprehensive loss and equity   (22)
Acquisition of subsidiaries 0 0
Transfer from asset held for sale 0  
Sale of businesses (1) 0
Ending balance £ (112) £ (261)