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Equity - Schedule of fair value of each share award used the Monte Carlo pricing model and weighted average assumptions (Details)
£ / shares in Units, £ in Millions, shares in Millions
 12 Months Ended
Jun. 30, 2022
GBP (£)
shares
£ / shares
Jun. 30, 2021
GBP (£)
shares
£ / shares
Jun. 30, 2020
GBP (£)
shares
£ / shares
Disclosure of reserves within equity [abstract]      
Risk free interest rate 0.40% (0.10%) 0.40%
Expected life of the awards 40 months 36 months 37 months
Dividend yield 2.10% 2.70% 1.90%
Weighted average share price £ 35.45 £ 25.57 £ 35.01
Weighted average fair value of awards granted in the year £ 27.29 £ 21.07 £ 8.99
Number of awards granted in the year | shares 2.1 2.1 1.7
Fair value of all awards granted in the year | £ £ 57 £ 45 £ 16