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Inventories (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Inventories      
Raw materials £ 15 £ 15  
Work in progress 3 3  
Finished goods 211 189  
Total 229 207  
Inventory impairment charge 2 3 £ 3
Inventory recognised as an expense 363 385 280
Reversals of inventory write-downs £ 0 £ 0 £ 0