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Working capital - Inventories (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Summary Of Additional Information About Working Capital [Abstract]    
Raw materials and consumables £ 348 £ 363
Work in progress 60 48
Maturing inventories 4,668 4,562
Finished goods and goods for resale 969 799
Inventories £ 6,045 £ 5,772