Aerotus -
The full amount in the balance sheet is shown as £886,354.
Note 7 separates them out into listed investments £386,354 and unlisted investments of £500,000. MXP were unlisted at the date of the H1 close.
There appear to have been changes in the listed investments which are up on the March 2005 figure of £120,750.
Remember that market value doesn't appear in the BS - only cost is featured. Except in the case of an unlisted investment - if market value drops below cost, then market value will be shown.