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Treasury shares (Details)
shares in Thousands
 12 Months Ended
Jun. 30, 2020
GBP (£)
shares
Disclosure of classes of share capital  
Share issue related cost £ 41,000
Treasury shares, Value  
Balance at beginning of the year 415,202,000
Acquisition of treasury shares (21,305,000)
Balance at end of the year £ 351,232,000
Treasury shares  
Treasury shares, Number of shares  
Acquisition of treasury shares | shares (1,683)
Closing balance | shares (1,683)
Treasury shares, Value  
Acquisition of treasury shares £ (21,305,000)
Balance at end of the year £ (21,305,000)