26 January 2010



M&G High Income Investment Trust P.L.C.

Disclosure of Interests in Shares under the Transparency Obligations Directive
(Disclosure and Transparency Rules) Instrument 2006





M&G High Income Investment Trust P.L.C. (M&G HIT) announces that it has today
been informed that Prudential plc and certain of its subsidiaries are interested
in 119,809,810 M&G HIT Income shares representing 60.98% of the issued capital
of Income shares and 119,809,810 M&G HIT Capital shares representing 60.98% of
the issued capital of Capital shares.  These shares are held within Income &
Growth Units and Package Units on behalf of M&G ISA account holders.











J.P. McClelland

Secretary



[HUG#1377749]