Software £m
Cost
At 1 January 2018	29.8
Additions	1.7
At 31 December 2018	31.5
Amortisation
At 1 January 2018	7.6
Charge for the year	1.6
At 31 December 2018	9.2
Net book value
At 31 December 2018	22.3
At 31 December 2017	22.2

Refer to note 10 to the consolidated financial statements for more information.