Holding(s) in Company

Henderson High Income Trust PLC
09 November 2007


TR-1:               Notification of major interests in shares


1. Identity of the issuer or the underlying issuer of existing     Henderson High Income Trust Plc
shares to which voting rights are attached:


2. Reason for notification (yes/no)

An acquisition or disposal of voting rights                                     Yes

An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached

An event changing the breakdown of voting rights

Other (please specify):______________


3. Full name of person(s) subject to the notification              Legal & General Group Plc (L&G)
obligation:


4. Full name of shareholder(s) (if different from 3.):                           N/A


5. Date of the transaction (and date on which the threshold is             07 November 2007
crossed or reached if different):


6. Date on which issuer notified:                                          08 November 2007


7. Threshold(s) that is/are crossed or reached:                             Above 3% (L&G)


8. Notified details:





A: Voting rights attached to shares
Class/type  Situation previous to the     Resulting situation after the triggering transaction
of shares   Triggering transaction

 if         Number of      Number of      Number of   Number of voting rights % of voting rights
possible    Shares         Voting Rights  shares
using the
ISIN CODE                                 Direct      Direct       Indirect   Direct       Indirect

ORD                   Below 3%            2,722,834   2,722,834               3.17
GBP0.05


B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial    Expiration date Exercise/ Conversion      Number of voting rights    % of voting
instrument                           Period/ Date              that may be acquired if    rights
                                                               the instrument is
                                                               exercised/ converted.



Total (A+B)
Number of voting rights                            % of voting rights
                   
 2,722,834                                               3.17





9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:

Legal & General Group Plc (Direct and Indirect) (Group)

Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct
and Indirect)

Legal & General Investment Management Limited (Indirect) (LGIM)

                    Legal & General Group Plc (Direct) (L&G) (2,722,834 - 3.17% = LGAS, LGPL & PMC)

Legal & General Investment Management (Holdings) Limited       Legal & General Insurance Holdings Limited (Direct)
(Direct) (LGIMHD)                                              (LGIH)

Legal & General Assurance (Pensions Management) Limited  (PMC) Legal & General Assurance Society Limited  (LGAS & LGPL)

                                                               Legal & General Pensions Limited (Direct)  (LGPL)



Proxy Voting:

10. Name of the proxy holder:                                                       N/A

11. Number of voting rights proxy holder will cease to hold:                        N/A

12. Date on which proxy holder will cease to hold voting rights:                    N/A


13. Additional information:                 Notification using the total voting rights figure of  85,835,744

                                             Please note this notification has been delayed due to the large
                                             number of disclosures required following a substantial amount of
                                              new business which has come to us in the form of an in-specie
                                                                        transfer.

14. Contact name:                                                   Helen Lewis (LGIM)

15. Contact telephone number:                                         020 3124 3851




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