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Financial risk management - Liquidity risk (Details) - GBP (£)
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Details of liquidity risk        
Cash and cash equivalents £ 110,658,000 £ 51,539,000 £ 307,637,000 £ 242,022,000
Within 1 year        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 239,066,000 203,920,000    
Financial liabilities, undiscounted cash flows 240,851,000 205,126,000    
Within 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 160,375,000 184,116,000    
Within 1 year | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 77,203,000 18,640,000    
Within 1 year | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 1,488,000 1,164,000    
Within 1 year | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 1,793,000 2,284,000    
Within 1 year | Cash inflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows (8,000) (1,078,000)    
Between 1 and 2 years        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 58,933,000 46,814,000    
Financial liabilities, undiscounted cash flows 60,640,000 47,543,000    
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 41,794,000 27,738,000    
Between 1 and 2 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 16,646,000 18,640,000    
Between 1 and 2 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 493,000 436,000    
Between 1 and 2 years | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 1,707,000 2,284,000    
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 73,537,000 79,950,000    
Financial liabilities, undiscounted cash flows 75,244,000 84,518,000    
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 27,908,000 25,805,000    
Between 2 and 5 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 45,142,000 53,341,000    
Between 2 and 5 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 487,000 804,000    
Between 2 and 5 years | Cash outflow        
Contractual undiscounted cash flows including interest        
Derivative financial liabilities, undiscounted cash flows 1,707,000 4,568,000    
Later than 5 years        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 493,625,000 567,458,000    
Financial liabilities, undiscounted cash flows 493,625,000 567,458,000    
Later than 5 years | Borrowings        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows 489,983,000 563,757,000    
Later than 5 years | Lease liabilities        
Contractual undiscounted cash flows including interest        
Non-derivative financial liabilities, undiscounted cash flows £ 3,642,000 £ 3,701,000