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Inventories (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Inventories    
Raw materials £ 15 £ 13
Work in progress 2 2
Finished goods 183 121
Total 200 136
Inventory impairment charge 3 16
Inventory recognised as an expense 280 210
Reversals of inventory write-downs £ 0 £ 0