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Financial instruments and risk management - Schedule of net borrowings interest rate profile (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 15,541 £ 14,137 £ 12,109
Net borrowings interest rate 100.00% 100.00%  
Fixed rate      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 11,961 £ 11,070  
Net borrowings interest rate 77.00% 78.00%  
Floating rate      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 3,225 £ 2,612  
Net borrowings interest rate 21.00% 19.00%  
Impact of financial derivatives and fair value adjustments      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ (93) £ (20)  
Net borrowings interest rate (1.00%) 0.00%  
Lease liabilities      
Disclosure of financial instruments by type of interest rate [line items]      
Net borrowings £ 448 £ 475  
Net borrowings interest rate 3.00% 3.00%