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Operating costs - Auditor fees (Details) - Principal auditor - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of operating costs [line items]      
Audit of these financial statements £ 4.2 £ 3.8 £ 5.3
Audit of financial statements of subsidiaries 6.1 4.4 3.6
Audit related assurance services(1) 2.5 2.6 2.4
Total audit fees (Audit fees) 12.8 10.8 11.3
Other assurance services (Audit related fees)(2) 0.7 0.8 0.8
Auditors remuneration, Total 13.5 11.6 12.1
Review of interim financial information £ 0.3 £ 0.4 £ 0.4