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Taxation - Change in deferred tax assets and liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance £ (1,853) £ (1,894)
Exchange differences 173 5
Recognised in income statement – continuing operations (16) 134
Reclassification 0 0
Recognised in other comprehensive loss and equity (8) (18)
Tax rate change – recognised in income statement (78) (45)
Tax rate change – recognised in other comprehensive loss and equity (48) (16)
Acquisition of subsidiaries (15) (19)
Ending balance (1,845) (1,853)
Tax losses    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 61 24
Exchange differences (5) (1)
Recognised in income statement – continuing operations 0 7
Reclassification 0 (3)
Recognised in other comprehensive loss and equity 0 34
Tax rate change – recognised in income statement 1 0
Tax rate change – recognised in other comprehensive loss and equity 0 0
Acquisition of subsidiaries 0 0
Ending balance 57 61
Other temporary differences    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 234 264
Exchange differences (17) (7)
Recognised in income statement – continuing operations 29 27
Reclassification (7) (11)
Recognised in other comprehensive loss and equity (2) (33)
Tax rate change – recognised in income statement 10 (6)
Tax rate change – recognised in other comprehensive loss and equity (4) 0
Acquisition of subsidiaries 1 0
Ending balance 244 234
Property, plant and equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (340) (349)
Exchange differences 26 0
Recognised in income statement – continuing operations (28) (10)
Reclassification 0 8
Recognised in other comprehensive loss and equity 0 0
Tax rate change – recognised in income statement (39) 11
Tax rate change – recognised in other comprehensive loss and equity 0 0
Acquisition of subsidiaries 0 0
Ending balance (381) (340)
Intangible assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (1,736) (1,795)
Exchange differences 176 12
Recognised in income statement – continuing operations (19) 115
Reclassification 7 6
Recognised in other comprehensive loss and equity 0 (3)
Tax rate change – recognised in income statement (48) (52)
Tax rate change – recognised in other comprehensive loss and equity 0 0
Acquisition of subsidiaries (16) (19)
Ending balance (1,636) (1,736)
Post employment plan    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance (72) (38)
Exchange differences (7) 1
Recognised in income statement – continuing operations 2 (5)
Reclassification 0 0
Recognised in other comprehensive loss and equity (6) (16)
Tax rate change – recognised in income statement (2) 2
Tax rate change – recognised in other comprehensive loss and equity (44) (16)
Acquisition of subsidiaries 0 0
Ending balance £ (129) £ (72)