13  Intangible assets

Group

Company

Group

Licences

and product

rights

£’000

Other

£’000

Total

£’000

Other

£’000

Cost

At 1 July 2007

10,286

1,225

11,511

1,225

Additions

4,586

–

4,586

–

Disposals

(491)

–

(491)

–

Exchange adjustments

2,173

–

2,173

–

At 30 June 2008

16,554

1,225

17,779

1,225

Additions

6,743

–

6,743

–

Disposals

(108)

–

(108)

–

Exchange adjustments

1,379

–

1,379

–

At 30 June 2009

24,568

1,225

25,793

1,225

Amortisation and impairment

At 1 July 2007

1,197

272

1,469

272

Charge for the year

1,415

68

1,483

68

Disposals

(51)

–

(51)

–

Impairment charge

13

–

13

–

Exchange adjustments

54

–

54

–

At 30 June 2008

2,628

340

2,968

340

Charge for the year

2,016

68

2,084

68

Disposals

(6)

–

(6)

–

Impairment charge (note 5)

898

–

898

–

Exchange adjustments

141

–

141

–

At 30 June 2009

5,677

408

6,085

408

Net book value

At 30 June 2009

18,891

817

19,708

817

At 30 June 2008

13,926

885

14,811

885

At 30 June 2007

9,089

953

10,042

953

Additions in the current period principally relate to the acquisition of rights to the silver nanotechnology, the zinc technology and the purchase of additional rights under an existing agreement for hydrogen peroxide technology. Additions of £5,363,000 were from non-cash transactions.

The other intangible fixed assets arose on the buy-out of future royalty obligations on certain of the Group’s products. The Directors have determined that the useful economic life of the other intangible asset is 18 years.

Exchange adjustments arise as a result of the impact of the difference in the Sterling : Euro exchange rate at the beginning and end of the year on balances recorded in Euros.