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Inventories (Details) - GBP (£)
£ in Millions
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Inventories [Abstract]      
Raw materials and consumables £ 322 £ 338 £ 327
Work in progress 59 46 51
Maturing inventories 4,358 4,334 4,201
Finished goods and goods for resale 720 754 697
Inventories £ 5,459 £ 5,472 £ 5,276