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Net borrowings - Maturity of gross borrowings before derivative financial instruments (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 16,020 £ 14,727
Within one year    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 1,522 1,862
Between one and three years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 2,817 2,623
Between three and five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments 2,625 2,788
Beyond five years    
Disclosure of detailed information about borrowings [line items]    
Total borrowings before derivative financial instruments £ 9,056 £ 7,454