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Related party transactions - Directors remuneration (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits £ 9 £ 10 £ 10
Annual incentive plan 13 0 10
Non-Executive Directors' fees 1 1 1
Post employment benefits 1 2 3
Directors      
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits 2 2 2
Annual incentive plan 4 0 2
Non-Executive Directors' fees 1 1 1
Share option exercises 0 0 2
Shares vesting 1 11 13
Post employment benefits 0 1 1
Directors remuneration £ 8 £ 15 £ 21