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Post employment benefits - Timing of benefit payments and average duration of defined benefit obligations and distribution of timing of benefit payments (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 0 £ 0
United Kingdom    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 9,160 £ 8,835
Average duration of the defined benefit obligation 18 years 18 years
United Kingdom | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 288 £ 346
United Kingdom | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 1,112 1,202
United Kingdom | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,606 2,556
United Kingdom | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,314 2,083
United Kingdom | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,840 2,648
Ireland    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 2,412 £ 2,676
Average duration of the defined benefit obligation 18 years 18 years
Ireland | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 84 £ 76
Ireland | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 338 364
Ireland | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 656 691
Ireland | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 588 627
Ireland | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 746 918
United States    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 727 £ 984
Average duration of the defined benefit obligation 11 years 11 years
United States | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 52 £ 56
United States | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 145 202
United States | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 247 357
United States | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 145 196
United States | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 138 £ 173