11. Other intangible assets

Software
£m
Non-compete agreements
£m
Customer relationships
£m
Total
£m
Cost
At 1 January 201214.610.124.7
Exchange differences(0.4)(1.2)(1.6)
Additions3.63.6
Acquired on acquisition of businesses2.924.827.7
Disposals(0.1)(0.1)
At 1 January 201317.72.933.754.3
Exchange differences(1.1)(1.1)
Additions3.03.0
Disposals(0.5)(0.5)
At 31 December 201320.22.932.655.7
Amortisation
At 1 January 201210.05.815.8
Exchange differences(0.3)(0.4)(0.7)
Charge for the year2.20.11.94.2
At 1 January 201311.90.17.319.3
Exchange differences(0.8)(0.8)
Charge for the year1.00.73.85.5
Disposals(0.5)(0.5)
At 31 December 201312.40.810.323.5
Carrying amount
At 31 December 20137.82.122.332.2
At 31 December 20125.82.826.435.0

The amortisation periods for intangible assets are:

Years
Software3 to 5
Non-compete agreements4 to 5
Customer relationships10 to 15

Intangible assets are amortised on a straight-line basis and the amortisation is recognised within administration expenses.