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Summary of significant accounting policies - Leases (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of expected impact of initial application of new standards or interpretations        
Profit before tax   £ 27,476 £ 25,833 [1] £ 56,588 [1]
Operating profit   49,985 43,871 [1] 80,865 [1]
Operating cash flows   244,784 95,250 227,660
Financing cash flows   (27,076) (22,401) £ (23,690)
Operating lease commitment   8,087 £ 8,361  
Forecast | Increase (decrease) due to application of IFRS 16        
Disclosure of expected impact of initial application of new standards or interpretations        
Right-of-use assets   6,000    
Lease liabilities   £ 6,000    
Profit before tax £ (100)      
Adjusted EBITDA 1,700      
Operating profit 1,700      
Operating cash flows 1,600      
Financing cash flows £ (1,600)      
[1] Comparative amounts have been restated—see note 33 for further details.