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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Revenue from contracts with customers      
Revenue from contracts with customers £ 494,117 £ 509,041 £ 627,122
Customer A      
Revenue from contracts with customers      
Revenue from contracts with customers 177,160 118,069 150,959
Customer B      
Revenue from contracts with customers      
Revenue from contracts with customers 77,426 77,852 78,813
Customer C      
Revenue from contracts with customers      
Revenue from contracts with customers £ 73,827   £ 83,138
Customer D      
Revenue from contracts with customers      
Revenue from contracts with customers   £ 52,269