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Financial instruments and risk management - Available undrawn committed bank facilities (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities £ 2,518 £ 5,285
Within one year    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities 540 2,439
Between one and two years    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities 691 610
Expiring after two years    
Disclosure of information about undrawn borrowing facilities [line items]    
Undrawn committed bank facilities £ 1,287 £ 2,236