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Accounting policies (Details) - GBP (£)
£ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Disclosure of expected impact of initial application of new standards or interpretations            
Profit before tax £ 37,648 £ 37,813 [1] £ 46,396 £ 54,938 [1]    
Operating profit 43,994 42,176 [1] 57,868 60,084 [1]    
Operating cash flows £ (42,407) (44,421) 72,375 (26,508)    
Financing cash flows   £ (106) £ (3,750) £ (206)    
Forecast            
Disclosure of expected impact of initial application of new standards or interpretations            
Right-of-use assets           £ 4,800
Forecast | Increase (decrease) due to application of IFRS 16            
Disclosure of expected impact of initial application of new standards or interpretations            
Profit before tax         £ (100)  
Adjusted EBITDA         1,400  
Operating profit         1,400  
Operating cash flows         1,300  
Financing cash flows         £ (1,300)  
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.