Blocklisting Interim Review

Henderson High Income Trust PLC
05 January 2007

                        BLOCK LISTING SIX MONTHLY RETURN



Information provided on this form must be typed or printed electronically.



To:  The FSA



Date: 5 JANUARY 2007


Name of applicant:                                         HENDERSON HIGH INCOME TRUST PLC

Name of scheme:                                            Henderson Investment Trust Share Plan and Direct Dealing
                                                           Service

Period of return:                           From:          5 July 2006            To:        4 January 2007

Balance under scheme from previous return:                 382,712 ordinary shares of 5p each

The amount by which the block scheme has been increased,   1,100,000 ordinary shares of 5p each
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during   Nil
period:

Balance under scheme not yet issued/allotted at end of     1,482,712 ordinary shares of 12.5p each
period

Number and class of securities originally listed and the   400,000 ordinary shares on 16 June 1993 
date of admission                                          1,308,971 ordinary shares on 13 November 2001
                                                           1,353,637 ordinary shares on 7 June 2002
                                                           1,365,187 ordinary shares on 11 June 2002
                                                           1,388,888 ordinary shares on 12 June 2002

Total number of securities in issue at the end of the      69,687,798 ordinary shares of 5p each
period


Name of contact:                                           Deborah Trickett
Address of contact:                                        Henderson Global Investors, 4 Broadgate, London EC2M 2DA
Telephone number of contact:                               020 7818 6816



SIGNED BY   ______________________________________________

Deborah Trickett, for and on behalf of Henderson Secretarial Services Limited,

Company Secretary to

Henderson High Income Trust plc







If you knowingly or recklessly give false or misleading information you may be
liable to prosecution.


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