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Working capital - Inventories (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Summary Of Additional Information About Working Capital [Abstract]    
Raw materials and consumables £ 543 £ 489
Work in progress 132 86
Maturing inventories 5,794 5,229
Finished goods and goods for resale 1,192 1,290
Inventories £ 7,661 £ 7,094