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Treasury shares (Details) - GBP (£)
£ in Thousands
 6 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Treasury shares, Value      
Balance at beginning of the period £ 351,232 £ 460,999 £ 415,202
Acquisition of treasury shares   (21,305)  
Balance at end of the period £ 405,579 £ 351,232 £ 460,999
Treasury shares      
Treasury shares, Number of shares      
Opening balance (1,683)    
Acquisition of treasury shares 0 (1,683) 0
Closing balance (1,683) (1,683)  
Treasury shares, Value      
Balance at beginning of the period £ (21,305)    
Acquisition of treasury shares 0 £ (21,305) £ 0
Balance at end of the period £ (21,305) £ (21,305)