Blocklisting Interim Review

Henderson High Income Trust PLC
05 July 2006

                        BLOCKLISTING SIX MONTHLY RETURN

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



To:  The FSA

Date: 05.07.2006



1. Name of applicant:


Henderson High Income Trust plc



2. Name of scheme


Henderson Investment Trust Share Plan and Direct Dealing Service



3. Period of return:


From      5 January 2006                             To     4 July 2006



4. Balance under scheme from previous return:


1,407,712 ordinary shares of 5p each



5. The amount by which the block scheme has been increased, if the scheme has
been increased since the date of the last return


Nil



6. Number of securities issued/allotted under scheme during period:


1,025,000 ordinary shares of 5p each



7. Balance under scheme not yet issued/allotted at end of period


382,712 ordinary shares of 5p each



8. Number and class of securities originally listed and the date of admission


400,000 ordinary shares on 16 June 1993

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



9. Total number of securities in issue at the end of the period


69,687,798 ordinary shares


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 .........................................

For and on behalf of Henderson Secretarial Services Limited

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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