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Inventories (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Inventories [Abstract]      
Raw materials and consumables £ 598 £ 489 £ 401
Work in progress 166 86 68
Maturing inventories 5,477 5,229 4,801
Finished goods and goods for resale 1,311 1,290 965
Inventories £ 7,552 £ 7,094 £ 6,235