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Other investments (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Other investments    
Weighted average effective interest rate 0.00% 0.40%
Other investments £ 24 £ 2
Current portion 1 2
Non-current portion 23  
Financial assets either past due or impaired 0 0
Pound    
Other investments    
Other investments 1 2
Other currencies    
Other investments    
Other investments 23  
Six months to one year | Fixed    
Other investments    
Other investments £ 1 £ 2