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Financial instruments and risk management - Schedule of available undrawn committed bank facilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities £ 2,678 £ 2,789
Expiring within one year    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities 99 793
Expiring between one and two years    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities 496 103
Expiring after two years    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities £ 2,083 £ 1,893