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Related party transactions - Directors remuneration (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits £ 11 £ 10 £ 9
Annual incentive plan 6 13 13
Non-Executive Directors' fees 1 1 1
Post employment benefits 2 2 1
Directors      
Disclosure of transactions between related parties [line items]      
Salaries and short-term employee benefits 3 3 2
Annual incentive plan 2 4 4
Non-Executive Directors' fees 1 1 1
Share option exercises 0 4 0
Shares vesting 4 3 1
Post employment benefits 1 0 0
Directors remuneration £ 11 £ 15 £ 8