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Treasury shares (Details) - GBP (£)
£ in Thousands, shares in Thousands
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Treasury shares, Value        
Value of shares £ 246,745 £ 272,512 £ 405,579 £ 351,232
Treasury shares        
Treasury shares, Number of shares        
Number of shares (1,683) (1,683) (1,683) (1,683)
Treasury shares, Value        
Value of shares £ (21,305) £ (21,305) £ (21,305) £ (21,305)