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Inventories (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Inventories    
Raw materials £ 15 £ 15
Work in progress 3 2
Finished goods 189 183
Total 207 200
Inventory impairment charge 3 3
Inventory recognised as an expense 385 280
Reversals of inventory write-downs £ 0 £ 0