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Related party transactions - Amounts incurred by entity for provision of key management personnel services (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
Share-based payments 12 19 12
Post employment benefits 2 2 1
Termination benefits 0 0 2
Key management personnel remuneration £ 32 £ 45 £ 38