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BORROWINGS - Committed credit facilities (Details)
£ in Millions, $ in Millions
Jun. 30, 2023
USD ($)
Jun. 30, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Disclosure of detailed information about borrowings [line items]      
Borrowings   £ 9,865 £ 10,440
Revolving credit facilities      
Disclosure of detailed information about borrowings [line items]      
Borrowings   0 £ 0
Credit facility maturing September 2025      
Disclosure of detailed information about borrowings [line items]      
Undrawn credit facilities   £ 1,000  
Credit facility maturing September 2023      
Disclosure of detailed information about borrowings [line items]      
Undrawn credit facilities | $ $ 1,400