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Investments in associated undertakings (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investments in associated undertakings          
Balance at beginning     £ 30    
Share of profit from associates (net of tax)     9 £ 8 £ 8
Dividends received from associates     4 4 12
Balance at end £ 53 £ 30 53 30  
Revenue     3,714 2,957 2,803
Profit     232 263 186
Nippon Calmic Limited          
Investments in associated undertakings          
Balance at beginning     29 27  
Exchange differences     (1) (2)  
Share of profit from associates (net of tax)     8 8  
Dividends received from associates     4 4  
Balance at end £ 32 £ 29 32 29 £ 27
Tax expense on share of profit     4 4  
Ownership interest in associate 49.00% 49.00%      
Assets £ 66 £ 53 66 53  
Liabilities (33) (24) (33) (24)  
Revenue     52 52  
Profit     8 8  
Individually immaterial associated undertakings          
Investments in associated undertakings          
Balance at beginning     1    
Exchange differences     (1)    
Acquisition     20 1  
Share of profit from associates (net of tax)     1    
Balance at end £ 21 £ 1 21 1  
Unrecognised share of losses of associates     £ 1 £ 0