14 Intangible assets

 
 
  Brands
£m
Software
and
licences
£m
Contracts
and
committed
sales
£m
Customer
lists and
relationships
£m
Goodwill
£m
Sub-total
£m
Other
£m
Total
£m
Cost
At 1 January 2005 2.6 2.0 5.5 486.8 496.9 8.0 504.9
Subsidiaries acquired 2.7 1.2 26.7 75.3 105.9 105.9
Additions 4.0 4.0
At 31 December 2005 5.3 2.0 6.7 26.7 562.1 602.8 12.0 614.8
Subsidiaries acquired 0.6 0.2 7.9 39.3 48.0 48.0
Additions 1.4 1.4
At 31 December 2006 5.9 2.0 6.9 34.6 601.4 650.8 13.4 664.2
Amortisation and impairment
At 1 January 2005 0.4 0.2 1.2 1.8 2.9 4.7
Amortisation during the year 0.7 0.4 1.7 1.7 4.5 4.9 9.4
Impairment 12.0 12.0 12.0
At 31 December 2005 1.1 0.6 2.9 1.7 12.0 18.3 7.8 26.1
Amortisation during the year 1.2 0.4 0.9 4.4 6.9 1.2 8.1
At 31 December 2006 2.3 1.0 3.8 6.1 12.0 25.2 9.0 34.2
Net book value
At 1 January 2005 2.2 1.8 4.3 486.8 495.1 5.1 500.2
At 31 December 2005 4.2 1.4 3.8 25.0 550.1 584.5 4.2 588.7
At 31 December 2006 3.6 1.0 3.1 28.5 589.4 625.6 4.4 630.0

The amount in 'other intangibles' represents the consideration paid to AON to acquire the contract for the administration of the miners' personal injury liability claims on behalf of the Department of Trade and Industry. The useful life of other intangibles has been extended for a further 4 years, as the contract has now been extended.

Customer lists and relationships includes an amount of £11.0m in respect of relationships acquired with the BDML acquisition, which is being amortised over 10 years.