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Revenue from contracts with customers - Revenue derived from entities accounting for more than 10% of revenue (Details) - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Revenue from contracts with customers      
Revenue from contracts with customers £ 648,401 £ 583,201 £ 494,117
Customer A      
Revenue from contracts with customers      
Revenue from contracts with customers 178,118 146,114 177,160
Customer B      
Revenue from contracts with customers      
Revenue from contracts with customers £ 76,169 76,377 77,426
Customer C      
Revenue from contracts with customers      
Revenue from contracts with customers   £ 67,477 £ 73,827