There has been no change in the classification of financial assets and liabilities, the method and assumptions used in determining fair value and the categorisation of financial assets and liabilities within the fair value hierarchy from those disclosed in the Annual Report for the year ended 31 December 2016.
The Group enters into derivative financial instruments with financial institutions with investment grade credit ratings. The fair value of forward foreign exchange contracts is calculated by reference to quoted market forward exchange rates for contracts with similar maturity profiles. The fair value of currency swaps is determined by reference to quoted market spot rates. As a result, foreign forward exchange contracts and currency swaps are classified as Level 2 within the fair value hierarchy. The changes in counterparty credit risk had no material effect on the hedge effectiveness for derivatives designated in hedge relationships and other financial instruments recognised at fair value.
The fair value of investments is based upon third party pricing models for share issues. As a result, investments are considered Level 3 in the fair value hierarchy. There were no transfers between Levels 1, 2 and 3 during 2017 and 2016. For cash and cash equivalents, short-term loans and receivables, overdrafts and other short-term liabilities which have a maturity of less than three months, the book values approximate the fair values because of their short-term nature.
Long-term borrowings are measured in the balance sheet at amortised cost. As the Group’s long-term borrowings are not quoted publicly and as market prices are not available, their fair values are estimated by discounting future contractual cash flows to net present values at the current market interest rates available to the Group for similar financial instruments as at the year end.
The fair value of the private placement notes is determined using a discounted cash flow model based on prevailing market rates.