8. Fair value measurements

SFAS 157 defines fair value, establishes a consistent framework for measuring fair value and expands disclosure requirements about fair value measurements. SFAS 157 enables the reader of the financial statements to assess the inputs used to develop those measurements by establishing a hierarchy for ranking the quality and reliability of the information used to determine fair values. SFAS 157 requires that assets and liabilities carried at fair value be classified and disclosed in one of the following three categories:

Level 1 - quoted market prices in active markets for identical assets and liabilities

Level 2 - observable market based inputs or unobservable inputs that are corroborated by market data

Level 3 - unobservable inputs that are not corroborated by market data

The Group determines fair value based upon quoted prices when available or through the use of alternative approaches, such as discounting the expected cash flows using market interest rates commensurate with the credit quality and duration of the investment. The methods the Group uses to determine fair value on an instrument specific basis are detailed below. The following table summarises the valuation of our financial instruments at 2 August 2008 categorised by fair valuation level:

Description


Fair
value
Significant other
observable inputs
(Level 2)
  $m $m
Assets:
Forward foreign currency contracts and swaps 1.1 1.1
Forward commodity contracts 0.9 0.9
Liabilities:
Forward foreign currency contracts and swaps (2.5) (2.5)
Forward commodity contracts (3.2) (3.2)

The fair value of the Group's derivative instruments are based on market value equivalents at the balance sheet date.