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Working capital - Inventories (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Summary Of Additional Information About Working Capital [Abstract]    
Raw materials and consumables £ 489 £ 348
Work in progress 86 60
Maturing inventories 5,229 4,668
Finished goods and goods for resale 1,290 969
Inventories £ 7,094 £ 6,045