Annual Information Update

Henderson High Income Trust PLC 14 April 2008 HENDERSON HIGH INCOME TRUST PLC HENDERSON GLOBAL INVESTORS 14 APRIL 2008 HENDERSON HIGH INCOME TRUST PLC Annual Information Update Pursuant to Prospectus Rule 5.2, Henderson High Income Trust plc sets out below a brief description of the information published throughout the twelve months ended 31 March 2008 by or for the Company. Further details on the information may be obtained from the Company Secretary or from the Company's website (www.itshenderson.com). All information was notified to a RIS in London. Some of the information referred to below was provided as at a specific date and may now be out of date. Net Asset Value and General Announcements • Net Asset Value(s) 2008-03-31 • Net Asset Value(s) 2008-03-28 • Director/PDMR Shareholding 2008-03-28 • Net Asset Value(s) 2008-03-27 • Net Asset Value(s) 2008-03-26 • Final Results 2008-03-26 • Net Asset Value(s) 2008-03-25 • Net Asset Value(s) 2008-03-20 • Net Asset Value(s) 2008-03-19 • Net Asset Value(s) 2008-03-18 • Net Asset Value(s) 2008-03-17 • Net Asset Value(s) 2008-03-14 • Net Asset Value(s) 2008-03-13 • Monthly Fact Sheet 2008-03-12 • Net Asset Value(s) 2008-03-12 • Director/PDMR Shareholding 2008-03-12 • Net Asset Value(s) 2008-03-11 • Net Asset Value(s) 2008-03-10 • Net Asset Value(s) 2008-03-07 • Net Asset Value(s) 2008-03-06 • Net Asset Value(s) 2008-03-05 • Net Asset Value(s) 2008-03-04 • Net Asset Value(s) 2008-03-03 • Net Asset Value(s) 2008-02-28 • Net Asset Value(s) 2008-02-27 • Net Asset Value(s) 2008-02-26 • Net Asset Value(s) 2008-02-25 • Net Asset Value(s) 2008-02-22 • Net Asset Value(s) 2008-02-21 • Net Asset Value(s) 2008-02-20 • Net Asset Value(s) 2008-02-19 • Net Asset Value(s) 2008-02-18 • Net Asset Value(s) 2008-02-15 • Net Asset Value(s) 2008-02-14 • Monthly Fact Sheet 2008-02-14 • Net Asset Value(s) 2008-02-13 • Net Asset Value(s) 2008-02-12 • Net Asset Value(s) 2008-02-11 • Net Asset Value(s) 2008-02-08 • Net Asset Value(s) 2008-02-07 • Net Asset Value(s) 2008-02-06 • Director/PDMR Shareholding 2008-02-05 • Net Asset Value(s) 2008-02-05 • Net Asset Value(s) 2008-02-04 • Net Asset Value(s) 2008-02-01 • Net Asset Value(s) 2008-01-31 • Director/PDMR Shareholding 2008-01-30 • Net Asset Value(s) 2008-01-30 • Net Asset Value(s) 2008-01-29 • Net Asset Value(s) 2008-01-28 • Transaction in Close Period 2008-01-25 • Net Asset Value(s) 2008-01-25 • Net Asset Value(s) 2008-01-24 • Net Asset Value(s) 2008-01-23 • Net Asset Value(s) 2008-01-22 • Director/PDMR Shareholding 2008-01-21 • Net Asset Value(s) 2008-01-21 • Net Asset Value(s) 2008-01-18 • Net Asset Value(s) 2008-01-17 • Net Asset Value(s) 2008-01-16 • Net Asset Value(s) 2008-01-15 • Net Asset Value(s) 2008-01-14 • Net Asset Value(s) 2008-01-11 • Monthly Fact Sheet 2008-01-11 • Net Asset Value(s) 2008-01-10 • Net Asset Value(s) 2008-01-09 • Blocklisting Interim Review 2008-01-08 • Net Asset Value(s) 2008-01-08 • Net Asset Value(s) 2008-01-07 • Net Asset Value(s) 2008-01-04 • Net Asset Value(s) 2008-01-03 • Total Voting Rights 2008-01-03 • Portfolio Update 2008-01-03 • Net Asset Value(s) 2008-01-02 • Net Asset Value(s) 2007-12-28 • Net Asset Value(s) 2007-12-27 • Net Asset Value(s) 2007-12-21 • Net Asset Value(s) 2007-12-20 • Net Asset Value(s) 2007-12-19 • Net Asset Value(s) 2007-12-18 • Net Asset Value(s) 2007-12-17 • Monthly Fact Sheet 2007-12-14 • Net Asset Value(s) 2007-12-14 • Net Asset Value(s) 2007-12-13 • Net Asset Value(s) 2007-12-12 • Net Asset Value(s) 2007-12-11 • Net Asset Value(s) 2007-12-10 • Net Asset Value(s) 2007-12-07 • Net Asset Value(s) 2007-12-06 • Net Asset Value(s) 2007-12-05 • Transaction in Own Shares 2007-12-05 • Net Asset Value(s) 2007-12-04 • Net Asset Value(s) 2007-12-03 • Net Asset Value(s) 2007-11-30 • Net Asset Value(s) 2007-11-29 • Net Asset Value(s) 2007-11-28 • Net Asset Value(s) 2007-11-27 • Net Asset Value(s) 2007-11-26 • Net Asset Value(s) 2007-11-23 • Net Asset Value(s) 2007-11-22 • Net Asset Value(s) 2007-11-21 • Dividend Declaration 2007-11-21 • Net Asset Value(s) 2007-11-20 • Net Asset Value(s) 2007-11-19 • Net Asset Value(s) 2007-11-16 • Net Asset Value(s) 2007-11-15 • Net Asset Value(s) 2007-11-14 • Monthly Fact Sheet 2007-11-14 • Net Asset Value(s) 2007-11-13 • Net Asset Value(s) 2007-11-12 • Holding(s) in Company 2007-11-09 • Net Asset Value(s) 2007-11-09 • Net Asset Value(s) 2007-11-08 • Net Asset Value(s) 2007-11-07 • Net Asset Value(s) 2007-11-06 • Director/PDMR Shareholding 2007-11-05 • Net Asset Value(s) 2007-11-05 • Net Asset Value(s) 2007-11-02 • Net Asset Value(s) 2007-11-01 • Net Asset Value(s) 2007-10-31 • Net Asset Value(s) 2007-10-30 • Net Asset Value(s) 2007-10-29 • Net Asset Value(s) 2007-10-26 • Net Asset Value(s) 2007-10-25 • Net Asset Value(s) 2007-10-24 • Net Asset Value(s) 2007-10-23 • Net Asset Value(s) 2007-10-22 • Net Asset Value(s) 2007-10-19 • Net Asset Value(s) 2007-10-18 • Net Asset Value(s) 2007-10-17 • Net Asset Value(s) 2007-10-16 • Monthly Fact Sheet 2007-10-16 • Net Asset Value(s) 2007-10-15 • Net Asset Value(s) 2007-10-12 • Net Asset Value(s) 2007-10-11 • Net Asset Value(s) 2007-10-10 • Net Asset Value(s) 2007-10-09 • Net Asset Value(s) 2007-10-08 • Net Asset Value(s) 2007-10-05 • Net Asset Value(s) 2007-10-04 • Net Asset Value(s) 2007-10-03 • Net Asset Value(s) 2007-10-02 • Portfolio Update 2007-10-02 • Net Asset Value(s) 2007-10-01 • Net Asset Value(s) 2007-09-28 • Net Asset Value(s) 2007-09-27 • Net Asset Value(s) 2007-09-26 • Net Asset Value(s) 2007-09-25 • Net Asset Value(s) 2007-09-24 • Net Asset Value(s) 2007-09-21 • Net Asset Value(s) 2007-09-20 • Director/PDMR Shareholding 2007-09-20 • Net Asset Value(s) 2007-09-19 • Net Asset Value(s) 2007-09-18 • Net Asset Value(s) 2007-09-17 • Monthly Fact Sheet 2007-09-14 • Net Asset Value(s) 2007-09-14 • Net Asset Value(s) 2007-09-13 • Net Asset Value(s) 2007-09-12 • Net Asset Value(s) 2007-09-11 • Net Asset Value(s) 2007-09-10 • Net Asset Value(s) 2007-09-07 • Net Asset Value(s) 2007-09-06 • Net Asset Value(s) 2007-09-05 • Net Asset Value(s) 2007-09-04 • Net Asset Value(s) 2007-09-03 • Net Asset Value(s) 2007-08-31 • Net Asset Value(s) 2007-08-30 • Net Asset Value(s) 2007-08-29 • Net Asset Value(s) 2007-08-28 • Net Asset Value(s) 2007-08-24 • Net Asset Value(s) 2007-08-23 • Net Asset Value(s) 2007-08-22 • Net Asset Value(s) 2007-08-21 • Net Asset Value(s) 2007-08-20 • Net Asset Value(s) 2007-08-17 • Net Asset Value(s) 2007-08-16 • Net Asset Value(s) 2007-08-15 • Net Asset Value(s) 2007-08-14 • Net Asset Value(s) 2007-08-13 • Monthly Fact Sheet 2007-08-10 • Net Asset Value(s) 2007-08-10 • Net Asset Value(s) 2007-08-09 • Half Year Reports 2007-08-09 • Net Asset Value(s) 2007-08-08 • Net Asset Value(s) 2007-08-07 • Net Asset Value(s) 2007-08-06 • Net Asset Value(s) 2007-08-03 • Net Asset Value(s) 2007-08-02 • Director/PDMR Shareholding 2007-08-02 • Net Asset Value(s) 2007-08-01 • Net Asset Value(s) 2007-07-31 • Net Asset Value(s) 2007-07-30 • Net Asset Value(s) 2007-07-27 • Net Asset Value(s) 2007-07-26 • Net Asset Value(s) 2007-07-25 • Interim Results 2007-07-25 • Net Asset Value(s) 2007-07-24 • Net Asset Value(s) 2007-07-23 • Net Asset Value(s) 2007-07-20 • Net Asset Value(s) 2007-07-19 • Net Asset Value(s) 2007-07-18 • Net Asset Value(s) 2007-07-17 • Monthly Fact Sheet 2007-07-16 • Net Asset Value(s) 2007-07-16 • Net Asset Value(s) 2007-07-13 • Net Asset Value(s) 2007-07-12 • Net Asset Value(s) 2007-07-11 • Net Asset Value(s) 2007-07-10 • Net Asset Value(s) 2007-07-09 • Net Asset Value(s) 2007-07-06 • Net Asset Value(s) 2007-07-05 • Blocklisting Interim Review 2007-07-05 • Net Asset Value(s) 2007-07-04 • Net Asset Value(s) 2007-07-03 • Portfolio Update 2007-07-03 • Net Asset Value(s) 2007-07-02 • Net Asset Value(s) 2007-06-29 • Net Asset Value(s) 2007-06-28 • Net Asset Value(s) 2007-06-27 • Net Asset Value(s) 2007-06-26 • Net Asset Value(s) 2007-06-25 • Net Asset Value(s) 2007-06-22 • Net Asset Value(s) 2007-06-21 • Net Asset Value(s) 2007-06-20 • Net Asset Value(s) 2007-06-19 • Monthly Fact Sheet 2007-06-18 • Net Asset Value(s) 2007-06-18 • Net Asset Value(s) 2007-06-15 • Net Asset Value(s) 2007-06-14 • Net Asset Value(s) 2007-06-13 • Net Asset Value(s) 2007-06-12 • Net Asset Value(s) 2007-06-11 • Net Asset Value(s) 2007-06-08 • Net Asset Value(s) 2007-06-07 • Net Asset Value(s) 2007-06-06 • Net Asset Value(s) 2007-06-05 • Net Asset Value(s) 2007-06-04 • Net Asset Value(s) 2007-06-01 • Net Asset Value(s) 2007-05-31 • Directorate Change 2007-05-30 • Net Asset Value(s) 2007-05-30 • Net Asset Value(s) 2007-05-29 • Net Asset Value(s) 2007-05-25 • Net Asset Value(s) 2007-05-24 • Net Asset Value(s) 2007-05-23 • Director/PDMR Shareholding 2007-05-23 • Net Asset Value(s) 2007-05-22 • Net Asset Value(s) 2007-05-21 • Net Asset Value(s) 2007-05-18 • Monthly Fact Sheet 2007-05-18 • Net Asset Value(s) 2007-05-17 • Net Asset Value(s) 2007-05-16 • Net Asset Value(s) 2007-05-15 • Result of AGM 2007-05-15 • Dividend Declaration 2007-05-15 • Net Asset Value(s) 2007-05-14 • Net Asset Value(s) 2007-05-11 • Net Asset Value(s) 2007-05-10 • Net Asset Value(s) 2007-05-09 • Net Asset Value(s) 2007-05-08 • Net Asset Value(s) 2007-05-04 • Holding(s) in Company 2007-05-03 • Net Asset Value(s) 2007-05-03 • Net Asset Value(s) 2007-05-02 • Director/PDMR Shareholding 2007-05-02 • Total Voting Rights 2007-05-02 • Net Asset Value(s) 2007-05-01 • Issue of New Shares 2007-04-30 • Net Asset Value(s) 2007-04-30 • Issue of New Shares - Amendmt 2007-04-30 • Net Asset Value(s) 2007-04-27 • Change of Director Info 2007-04-27 • Net Asset Value(s) 2007-04-26 • Net Asset Value(s) 2007-04-25 • Net Asset Value(s) 2007-04-24 • Net Asset Value(s) 2007-04-23 • Net Asset Value(s) 2007-04-20 • Result of EGM 2007-04-19 • Net Asset Value(s) 2007-04-19 • Monthly Fact Sheet 2007-04-18 • Net Asset Value(s) 2007-04-18 • Net Asset Value(s) 2007-04-17 • Net Asset Value(s) 2007-04-16 • Net Asset Value(s) 2007-04-13 • Net Asset Value(s) 2007-04-12 • Net Asset Value(s) 2007-04-11 • Net Asset Value(s) 2007-04-10 • Net Asset Value(s) 2007-04-05 • Annual Information Update 2007-04-05 • Net Asset Value(s) 2007-04-04 • Net Asset Value(s) 2007-04-03 • Portfolio Update 2007-04-03 • Net Asset Value(s) 2007-04-02 Companies House 169(1B) 07/02/2008 07/12/07 £ TI 400000@.05=20000 AA 22/01/2008 INTERIM ACCOUNTS MADE UP TO 30/11/07 AA 09/10/2007 INTERIM ACCOUNTS MADE UP TO 30/06/07 AUD 24/08/2007 AUDITOR'S RESIGNATION 288a 20/06/2007 NEW DIRECTOR APPOINTED AA 14/06/2007 FULL ACCOUNTS MADE UP TO 01/01/07 AA 13/06/2007 INTERIM ACCOUNTS MADE UP TO 27/04/07 363s 06/06/2007 RETURN MADE UP TO 14/05/07; BULK LIST AVAILABLE SEPARATELY 288b 30/05/2007 DIRECTOR RESIGNED RES 13 30/05/2007 MARKET PURCHASES 15/05/07 AUTH ALLOT OF SECURITY 15/05/07 DISAPP PRE-EMPT RIGHTS 15/05/07 MAXIMUM FEE 15/05/07 88(2)R 21/05/2007 AD 30/04/07--------- £ SI 16147946@.05=807397 £ IC 3471889/4279286 RES 10 11/05/2007 RE ISSUE SHARES 19/04/07 AUTH ALLOT OF SECURITY 19/04/07 - ENDS - For further information, please contact: Alex Crooke Henderson High Income Trust plc Telephone: 020 7818 4447 James de Sausmarez Head of Investment Trusts Henderson Global Investors Telephone: 020 7818 3349 This information is provided by RNS The company news service from the London Stock Exchange

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