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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Revenue from contracts with customers      
Revenue from contracts with customers. £ 509,041 £ 627,122 £ 589,758
Customer A      
Revenue from contracts with customers      
Revenue from contracts with customers. 118,069 150,959 155,932
Customer B      
Revenue from contracts with customers      
Revenue from contracts with customers. 77,852 78,813 £ 79,015
Customer C      
Revenue from contracts with customers      
Revenue from contracts with customers. £ 52,269    
Customer D      
Revenue from contracts with customers      
Revenue from contracts with customers.   £ 83,138