24. Inventories

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Types of inventories	31 December 2016	31 December 2015
Mobile phones	86.4	129.2
Laptops, tablets and modems	36.3	55.3
Set-top boxes and disc drives	42.0	13.2
Other inventories	114.0	83.3
Total net book value	278.7	281.0

note_24._inventories_table_1.xlsx

Other inventories comprise primarily of raw materials used in the production of set-top boxes.

Write-downs of inventories	2016	2015
Opening balance	17.0	21.4
Increase	10.2	7.0
Utilisation	(9.7)	(6.5)
Decrease	(1.1)	(4.9)
Closing balance	16.4	17.0

note_24._inventories_table_2.xlsx