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Operating costs - Narrative (Details)
£ in Millions
 12 Months Ended
Jun. 30, 2023
GBP (£)
employee
Jun. 30, 2022
GBP (£)
employee
Jun. 30, 2021
GBP (£)
employee
Disclosure of operating costs [line items]      
Number of employees on full time equivalent basis | employee 30,269 28,558 27,783
Average number of employees, including part time | employee 30,419 28,137 28,025
Other than principal auditor      
Disclosure of operating costs [line items]      
Auditor's remuneration for audit services £ 0.1 £ 0.1 £ 0.1
Principal auditor      
Disclosure of operating costs [line items]      
Auditor's remuneration for audit services 13.6 12.8 10.8
Audit services in respect of employee pension plans £ 0.3 £ 0.2 £ 0.2