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Other reserves - Translation Reserve Comprises (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reserves within equity [line items]        
Equity £ 3,734 £ 3,833 £ 4,160 £ 4,068
Translation reserve        
Disclosure of reserves within equity [line items]        
Equity 148 229 526 £ 227
Balance relating to continuing net investment hedges        
Disclosure of reserves within equity [line items]        
Equity (86) (53) (144)  
Balance relating to discontinued net investment hedges        
Disclosure of reserves within equity [line items]        
Equity (38) (68) (85)  
Balance related to foreign exchange differences on translation of foreign operations        
Disclosure of reserves within equity [line items]        
Equity £ 272 £ 350 £ 755