Net Asset Value(s)

30 December 2009 M&G High Income Investment Trust P.L.C. The Board of M&G High Income Investment Trust P.L.C. announce that the net asset value at 12:00 noon today was £242.6 million. Income Shares * 59.88p Capital Shares 0.00p Zero Dividend Preference Shares 63.62p Income & Growth Units 59.88p Package Units                     123.50p The net asset values have been calculated on a cum-income basis, with dividends payable deducted from net assets on the ex-dividend date.  Financial assets are valued on a mid-market price basis. * The ex-income NAV of each Income Shares is 57.17p. [HUG#1369355]