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Inventories - Summary of Current Inventories (Detail) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Classes of current inventories [abstract]    
Raw materials £ 4 £ 5
Work in progress 1 2
Finished goods 81 93
Returns asset 5 5
Inventories £ 91 £ 105