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Financial instruments and risk management - Schedule of net borrowings interest rate profile (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 14,137 £ 12,109 £ 13,246
Net borrowings interest rate 100.00% 100.00%  
Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 11,070 £ 9,278  
Net borrowings interest rate 78.00% 77.00%  
Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 2,612 £ 2,521  
Net borrowings interest rate 19.00% 21.00%  
Impact of financial derivatives and fair value adjustments      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ (20) £ (53)  
Net borrowings interest rate 0.00% (1.00%)  
Lease liabilities      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 475 £ 363  
Net borrowings interest rate 3.00% 3.00%