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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, 2022
Jun. 30, 2021
Jun. 30, 2020
Revenue from contracts with customers      
Revenue from contracts with customers £ 583,201 £ 494,117 £ 509,041
Customer A      
Revenue from contracts with customers      
Revenue from contracts with customers 146,114 177,160 118,069
Customer B      
Revenue from contracts with customers      
Revenue from contracts with customers 76,377 77,426 77,852
Customer C      
Revenue from contracts with customers      
Revenue from contracts with customers £ 67,477 £ 73,827  
Customer D      
Revenue from contracts with customers      
Revenue from contracts with customers     £ 52,269