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Financial risk management - Liquidity risk (Details) - GBP (£)
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Details of liquidity risk        
Cash and cash equivalents £ 51,539,000 £ 307,637,000 £ 242,022,000 £ 290,267,000
Less than 1 year        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 203,920,000 236,160,000    
Financial liabilities, undiscounted cash flows 205,126,000 236,523,000    
Less than 1 year | Trade and other payables excluding social security and other taxes        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 184,116,000 217,136,000    
Less than 1 year | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 18,640,000 19,024,000    
Less than 1 year | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 1,164,000      
Less than 1 year | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 2,284,000 460,000    
Less than 1 year | Cash inflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows (1,078,000) (97,000)    
Between 1 and 2 years        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 46,814,000 80,566,000    
Financial liabilities, undiscounted cash flows 47,543,000 81,026,000    
Between 1 and 2 years | Trade and other payables excluding social security and other taxes        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 27,738,000 61,542,000    
Between 1 and 2 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 18,640,000 19,024,000    
Between 1 and 2 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 436,000      
Between 1 and 2 years | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 2,284,000 460,000    
Between 1 and 2 years | Cash inflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows (1,555,000)      
Between 2 and 5 years        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 79,950,000 76,730,000    
Financial liabilities, undiscounted cash flows 84,518,000 78,109,000    
Between 2 and 5 years | Trade and other payables excluding social security and other taxes        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 25,805,000 19,657,000    
Between 2 and 5 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 53,341,000 57,073,000    
Between 2 and 5 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 804,000      
Between 2 and 5 years | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 4,568,000 1,379,000    
Over 5 years        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 567,458,000 555,441,000    
Financial liabilities, undiscounted cash flows 567,458,000 555,441,000    
Over 5 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 563,757,000 £ 555,441,000    
Over 5 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows £ 3,701,000