Transaction in Close Period

Henderson High Income Trust PLC
25 January 2008



HENDERSON HIGH INCOME TRUST PLC


HENDERSON GLOBAL INVESTORS


25 January 2008





                        HENDERSON HIGH INCOME TRUST PLC



            Transactions in a Close Period - Listing Rule 15.5.1 (4)





Henderson High Income Trust plc ("the Company") confirms that:



a)         there is no unpublished information which constitutes price sensitive
information in respect of the Company's securities;



b)         the Company's net asset value per share is calculated and announced
through a Regulated Information Service ("RIS") on a daily basis;



c)         the Company has no reason to believe that there will be any material
difference between the net asset value announced on 25 January 2008 (as at close
of business on 24 January 2008) and the financial information to be published in
the preliminary announcement of its annual results;



d)         the Company has no unquoted investments.



e)         a dividend may be declared at the end of the close period but is not
expected to be price sensitive.



The Company is therefore exempt during the close period from the provisions of
the Model Code in respect of dealings by persons discharging managerial
responsibilities, purchases of its own securities and the sale of treasury
shares for cash or transfers.  If, in the period leading up to the preliminary
announcement of the results, the directors or the Company come into possession
of any inside information, this will be notified to a RIS before any such
transactions are undertaken.

The close period to which this relates is in respect of the financial year ended
31 December 2007.

                                    - ENDS -



For further information, please call:


Alex Crooke                                         James de Sausmarez
Fund Manager                                        Head of Investment Trusts
Henderson High Income Trust plc                     Henderson Global Investors
Telephone: [phone]                            Telephone: [phone]




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