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Inventories (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Inventories [Abstract]      
Raw materials and consumables £ 401 £ 348 £ 332
Work in progress 68 60 53
Maturing inventories 4,801 4,668 4,562
Finished goods and goods for resale 965 969 803
Inventories £ 6,235 £ 6,045 £ 5,750