Other investments
Non-current investments other than investments in subsidiaries and associates are stated at cost and an allowance for diminution in value is made where, in the opinion of the Directors, there is a decline other than temporary in the value of such investments. Where there has been a decline other than temporary in the value of an investment, such a decline is recognised as an expense in the period in which the decline is identified. All current investments are carried at the lower of cost and market value, determined on an aggregate portfolio basis by category of investments. Upon disposal of such investment, the difference between net disposal proceeds and its carrying amount is recognised in profit or loss.