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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, 2023
GBP (£)
shares
£ / shares
Jun. 30, 2022
GBP (£)
shares
£ / shares
Jun. 30, 2021
GBP (£)
shares
£ / shares
Disclosure of reserves within equity [abstract]      
Risk free interest rate 3.10% 0.40% (0.10%)
Expected life of the awards 35 months 40 months 36 months
Dividend yield 2.00% 2.10% 2.70%
Weighted average share price £ 37.58 £ 35.45 £ 25.57
Weighted average fair value of awards granted in the year £ 19.92 £ 27.29 £ 21.07
Number of awards granted in the year | shares 1.7 2.1 2.1
Fair value of all awards granted in the year | £ £ 34 £ 57 £ 45