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BORROWINGS - Long term borrowings (Details)
£ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Mar. 24, 2023
GBP (£)
Mar. 24, 2023
USD ($)
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
GBP (£)
Dec. 31, 2022
GBP (£)
Borrowings          
Non-current     £ 8,768   £ 10,003
Drew down term loan     156 £ 9,241  
Repayment of term loan     245 £ 11  
Pre-Separation Programme Notes          
Borrowings          
Non-current     £ 8,638   £ 9,861
Average effective pre-swap interest rate     3.00%   3.07%
Pre-Separation Programme Notes | Later than five years          
Borrowings          
Non-current     £ 5,077   £ 5,299
Non-voting preference shares          
Borrowings          
Non-current     25   25
Callable floating Rate Senior Notes due 2024          
Borrowings          
Redemption of notes | $   $ 300      
Gains (losses) on early redemption of debt £ 0        
Bonds          
Borrowings          
Non-current     £ 8,638   £ 9,861