4. Provisions for liabilities and charges


Quoted Companies
£000 		Unquoted Companies
£000 		Total
£000
At 1 August 2007 8,425 6,757 15,182
       
Increase of liability arising from gains on the revaluation of investments - 55 55
Decrease of liability arising from losses on the revaluation of investments (3,389) (791) (4,180)
Changes in fair value during the period (3,389) (736) (4,125)
       
Realisations during the period (194) - (194)
       
At 31 July 2008 4,842 6,021 10,863


Quoted Companies
£000 		Unquoted Companies
£000 		Total
£000
At 1 August 2008 4,842 6,021 10,863
       
Increase of liability arising from gains on the revaluation of investments 93 275 368
Decrease of liability arising from losses on the revaluation of investments (2,447) (1,543) (3,990)
Changes in fair value during the period (2,354) (1,268) (3,622)
       
Provisions utilised in the period (69) - (69)
Realisations during the period (1,848) (441) (2,289)
       
At 31 July 2009 571 4,312 4,883


Analysed by obligation:

Revenue Sharing Imperial College £000 Revenue Sharing
Other
£000 		Deferred Consideration £000 Total
£000
At 31 July 2008 9,476 908 479 10,863
Settlements and provisions utilised (2,232) (126) - (2,358)
Changes in fair value attributable to revenue share (3,164) (183) (275) (3,622)
At 31 July 2009 4,080 599 204 4,883

The revenue sharing provision represents monies due to Imperial College London upon the eventual realisation of investments held by the Group under the revenue sharing arrangements of the Technology and Pipeline Agreement (TPA) and in recognition of Imperial College London’s right to call for a transfer of its share of the Group’s holding in investments. The timing and amount of the realisation of the provision is dependent on the timing of the disposal of investments, which is uncertain as this is determined by the investment strategy.

The other revenue share represents monies due to other third parties in the Appointee Directors’ Pool in respect of the Imperial Innovations LLP assets acquired as part of the stepped acquisition in 2005. The timing and amount of the realisation of the provision is dependent on the timing of the disposal of investments, which is uncertain.

Deferred consideration represents monies due to Imperial College upon the eventual realisation of the Imperial Innovations LLP assets acquired from Imperial College as part of the private share placement in 2005. The deferred consideration at the date of acquisition (April 2005) was £554,000. At each Balance Sheet date a fair value adjustment is made until the eventual realisation of the assets. The timing of the realisation of the provision is dependent on the realisation of the Imperial Innovations LLP assets acquired from Imperial College, which is uncertain.