Annual Information Update

Henderson High Income Trust PLC 05 April 2007 HENDERSON HIGH INCOME TRUST PLC HENDERSON GLOBAL INVESTORS 5 APRIL 2007 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 4 April 2007 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 Some of the information referred to below was provided as at a specific date and may now be out of date.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(s) 2007-04-04 • Net Asset Value(s) 2007-04-03 • Portfolio Update 2007-04-03 • Net Asset Value(s) 2007-04-02 • Net Asset Value(s) 2007-03-30 • Net Asset Value(s) 2007-03-29 • Net Asset Value(s) 2007-03-28 • Net Asset Value(s) 2007-03-27 • Net Asset Value(s) 2007-03-26 • Net Asset Value(s) 2007-03-23 • Report and Accounts 2007-03-22 • Net Asset Value(s) 2007-03-22 • Proposed Share Issue 2007-03-22 • Net Asset Value(s) 2007-03-21 • Net Asset Value(s) 2007-03-20 • Net Asset Value(s) 2007-03-19 • Net Asset Value(s) 2007-03-16 • Monthly Fact Sheet 2007-03-16 • Net Asset Value(s) 2007-03-15 • Net Asset Value(s) 2007-03-14 • Net Asset Value(s) 2007-03-13 • Net Asset Value(s) 2007-03-12 • Net Asset Value(s) 2007-03-09 • Net Asset Value(s) 2007-03-08 • Net Asset Value(s) 2007-03-07 • Final Results 2007-03-06 • Net Asset Value(s) 2007-03-06 • Net Asset Value(s) 2007-03-05 • Net Asset Value(s) 2007-03-02 • Net Asset Value(s) 2007-03-01 • Net Asset Value(s) 2007-02-28 • Net Asset Value(s) 2007-02-27 • Net Asset Value(s) 2007-02-26 • Net Asset Value(s) 2007-02-23 • Holding(s) in Company 2007-02-22 • Net Asset Value(s) 2007-02-22 • Net Asset Value(s) 2007-02-21 • Net Asset Value(s) 2007-02-20 • Monthly Fact Sheet 2007-02-19 • Net Asset Value(s) 2007-02-19 • Net Asset Value(s) 2007-02-16 • Net Asset Value(s) 2007-02-15 • Net Asset Value(s) 2007-02-14 • Net Asset Value(s) 2007-02-13 • Net Asset Value(s) 2007-02-12 • Net Asset Value(s) 2007-02-09 • Net Asset Value(s) 2007-02-08 • Net Asset Value(s) 2007-02-07 • Net Asset Value(s) 2007-02-06 • Net Asset Value(s) 2007-02-05 • Net Asset Value(s) 2007-02-02 • Director/PDMR Shareholding 2007-02-02 • Net Asset Value(s) 2007-02-01 • Net Asset Value(s) 2007-01-31 • Net Asset Value(s) 2007-01-30 • Net Asset Value(s) 2007-01-29 • Net Asset Value(s) 2007-01-26 • Net Asset Value(s) 2007-01-25 • Net Asset Value(s) 2007-01-24 • Net Asset Value(s) 2007-01-23 • Total Voting Rights 2007-01-22 • Net Asset Value(s) 2007-01-22 • Net Asset Value(s) 2007-01-19 • Net Asset Value(s) 2007-01-18 • Net Asset Value(s) 2007-01-17 • Monthly Fact Sheet 2007-01-17 • Net Asset Value(s) 2007-01-16 • Net Asset Value(s) 2007-01-15 • Net Asset Value(s) 2007-01-12 • Net Asset Value(s) 2007-01-11 • Net Asset Value(s) 2007-01-10 • Net Asset Value(s) 2007-01-09 • Net Asset Value(s) 2007-01-08 • Net Asset Value(s) 2007-01-05 • Blocklisting Interim Review 2007-01-05 • Net Asset Value(s) 2007-01-04 • Listing Rule 15.4.11(2) 2007-01-03 • Net Asset Value(s) 2007-01-03 • Net Asset Value(s) 2007-01-02 • Net Asset Value(s) 2006-12-28 • Net Asset Value(s) 2006-12-27 • Re Martin Currie Inc & Growth 2006-12-22 • Net Asset Value(s) 2006-12-21 • Net Asset Value(s) 2006-12-20 • Total Voting Rights 2006-12-20 • Monthly Fact Sheet 2006-12-19 • Net Asset Value(s) 2006-12-19 • Net Asset Value(s) 2006-12-18 • Net Asset Value(s) 2006-12-15 • Net Asset Value(s) 2006-12-14 • Net Asset Value(s) 2006-12-13 • Net Asset Value(s) 2006-12-12 • Net Asset Value(s) 2006-12-11 • Net Asset Value(s) 2006-12-08 • Net Asset Value(s) 2006-12-07 • Net Asset Value(s) 2006-12-06 • Net Asset Value(s) 2006-12-05 • Net Asset Value(s) 2006-12-04 • Net Asset Value(s) 2006-11-30 • Net Asset Value(s) 2006-11-29 • Net Asset Value(s) 2006-11-28 • Net Asset Value(s) 2006-11-27 • Net Asset Value(s) 2006-11-24 • Net Asset Value(s) 2006-11-23 • Net Asset Value(s) 2006-11-22 • Net Asset Value(s) 2006-11-21 • Net Asset Value(s) 2006-11-20 • Net Asset Value(s) 2006-11-17 • Net Asset Value(s) 2006-11-16 • Monthly Fact Sheet 2006-11-16 • Net Asset Value(s) 2006-11-15 • Net Asset Value(s) 2006-11-14 • Net Asset Value(s) 2006-11-13 • Net Asset Value(s) 2006-11-10 • Net Asset Value(s) 2006-11-09 • Net Asset Value(s) 2006-11-08 • Net Asset Value(s) 2006-11-07 • Dividend Declaration 2006-11-07 • Net Asset Value(s) 2006-11-06 • Director/PDMR Shareholding 2006-11-03 • Net Asset Value(s) 2006-11-03 • Net Asset Value(s) 2006-11-02 • Net Asset Value(s) 2006-10-31 • Net Asset Value(s) 2006-10-30 • Net Asset Value(s) 2006-10-27 • Net Asset Value(s) 2006-10-26 • Net Asset Value(s) 2006-10-25 • Net Asset Value(s) 2006-10-24 • Net Asset Value(s) 2006-10-23 • Net Asset Value(s) 2006-10-20 • Net Asset Value(s) 2006-10-19 • Net Asset Value(s) 2006-10-18 • Net Asset Value(s) 2006-10-17 • Monthly Fact Sheet 2006-10-16 • Net Asset Value(s) 2006-10-16 • Net Asset Value(s) 2006-10-13 • Net Asset Value(s) 2006-10-12 • Net Asset Value(s) 2006-10-11 • Net Asset Value(s) 2006-10-10 • Net Asset Value(s) 2006-10-09 • Net Asset Value(s) 2006-10-06 • Net Asset Value(s) 2006-10-05 • Net Asset Value(s) 2006-10-04 • Net Asset Value(s) 2006-10-03 • Portfolio Update 2006-10-03 • Net Asset Value(s) 2006-10-02 • Net Asset Value(s) 2006-09-29 • Net Asset Value(s) 2006-09-28 • Net Asset Value(s) 2006-09-27 • Net Asset Value(s) 2006-09-26 • Net Asset Value(s) 2006-09-25 • Net Asset Value(s) 2006-09-22 • Net Asset Value(s) 2006-09-21 • Monthly Fact Sheet 2006-09-20 • Net Asset Value(s) 2006-09-20 • Net Asset Value(s) 2006-09-19 • Net Asset Value(s) 2006-09-18 • Net Asset Value(s) 2006-09-15 • Net Asset Value(s) 2006-09-14 • Net Asset Value(s) 2006-09-13 • Net Asset Value(s) 2006-09-12 • Net Asset Value(s) 2006-09-11 • Net Asset Value(s) 2006-09-08 • Net Asset Value(s) 2006-09-07 • Net Asset Value(s) 2006-09-06 • Net Asset Value(s) 2006-09-05 • Net Asset Value(s) 2006-09-04 • Net Asset Value(s) 2006-08-31 • Net Asset Value(s) 2006-08-30 • Net Asset Value(s) 2006-08-29 • Net Asset Value(s) 2006-08-25 • Net Asset Value(s) 2006-08-24 • Net Asset Value(s) 2006-08-23 • Interim Report 2006-08-22 • Net Asset Value(s) 2006-08-22 • Net Asset Value(s) 2006-08-21 • Net Asset Value(s) 2006-08-18 • Net Asset Value(s) 2006-08-17 • Net Asset Value(s) 2006-08-16 • Monthly Fact Sheet 2006-08-15 • Net Asset Value(s) 2006-08-15 • Net Asset Value(s) 2006-08-14 • Net Asset Value(s) 2006-08-11 • Net Asset Value(s) 2006-08-10 • Block listing 2006-08-10 • Net Asset Value(s) 2006-08-09 • Net Asset Value(s) 2006-08-08 • Net Asset Value(s) 2006-08-07 • Net Asset Value(s) 2006-08-04 • Director/PDMR Shareholding 2006-08-04 • Net Asset Value(s) 2006-08-03 • Net Asset Value(s) 2006-08-02 • Interim Results 2006-08-01 • Net Asset Value(s) 2006-07-31 • Net Asset Value(s) 2006-07-28 • Net Asset Value(s) 2006-07-27 • Net Asset Value(s) 2006-07-26 • Net Asset Value(s) 2006-07-25 • Net Asset Value(s) 2006-07-24 • Net Asset Value(s) 2006-07-21 • Net Asset Value(s) 2006-07-20 • Net Asset Value(s) 2006-07-19 • Net Asset Value(s) 2006-07-18 • Monthly Fact Sheet 2006-07-18 • Net Asset Value(s) 2006-07-17 • Net Asset Value(s) 2006-07-14 • Net Asset Value(s) 2006-07-13 • Net Asset Value(s) 2006-07-12 • Net Asset Value(s) 2006-07-11 • Net Asset Value(s) 2006-07-10 • Net Asset Value(s) 2006-07-07 • Net Asset Value(s) 2006-07-06 • Net Asset Value(s) 2006-07-05 • Blocklisting Interim Review 2006-07-05 • Portfolio Update 2006-07-04 • Net Asset Value(s) 2006-07-04 • Net Asset Value(s) 2006-07-03 • Net Asset Value(s) 2006-06-30 • Net Asset Value(s) 2006-06-29 • Net Asset Value(s) 2006-06-28 • Net Asset Value(s) 2006-06-27 • Net Asset Value(s) 2006-06-26 • Net Asset Value(s) 2006-06-23 • Net Asset Value(s) 2006-06-22 • Net Asset Value(s) 2006-06-21 • Net Asset Value(s) 2006-06-20 • Net Asset Value(s) 2006-06-19 • Monthly Fact Sheet 2006-06-16 • Net Asset Value(s) 2006-06-16 • Net Asset Value(s) 2006-06-15 • Net Asset Value(s) 2006-06-14 • Net Asset Value(s) 2006-06-13 • Net Asset Value(s) 2006-06-12 • Net Asset Value(s) 2006-06-09 • Net Asset Value(s) 2006-06-08 • Net Asset Value(s) 2006-06-07 • Net Asset Value(s) 2006-06-06 • Net Asset Value(s) 2006-06-05 • Net Asset Value(s) 2006-06-02 • Net Asset Value(s) 2006-05-31 • Net Asset Value(s) 2006-05-30 • Net Asset Value(s) 2006-05-26 • Net Asset Value(s) 2006-05-25 • Net Asset Value(s) 2006-05-24 • Net Asset Value(s) 2006-05-23 • Net Asset Value(s) 2006-05-22 • Net Asset Value(s) 2006-05-19 • Net Asset Value(s) 2006-05-18 • Net Asset Value(s) 2006-05-17 • Monthly Fact Sheet 2006-05-17 • Net Asset Value(s) 2006-05-16 • Net Asset Value(s) 2006-05-15 • Net Asset Value(s) 2006-05-12 • Net Asset Value(s) 2006-05-11 • Allotment of shares 2006-05-10 • Net Asset Value(s) 2006-05-10 • Net Asset Value(s) 2006-05-09 • Net Asset Value(s) 2006-05-08 • Net Asset Value(s) 2006-05-05 • Net Asset Value(s) 2006-05-04 • Director/PDMR Shareholding 2006-05-03 • Net Asset Value(s) 2006-05-03 • Dividend Declaration 2006-05-02 • Result of AGM 2006-05-02 • Net Asset Value(s) 2006-05-02 • Net Asset Value(s) 2006-04-28 • Net Asset Value(s) 2006-04-27 • Net Asset Value(s) 2006-04-26 • Net Asset Value(s) 2006-04-25 • Net Asset Value(s) 2006-04-24 • Net Asset Value(s) 2006-04-21 • Net Asset Value(s) 2006-04-20 • Monthly Fact Sheet 2006-04-19 • Net Asset Value(s) 2006-04-19 • Net Asset Value(s) 2006-04-18 • Net Asset Value(s) 2006-04-13 • Net Asset Value(s) 2006-04-12 • Net Asset Value(s) 2006-04-11 • Net Asset Value(s) 2006-04-10 • Net Asset Value(s) 2006-04-07 • Net Asset Value(s) 2006-04-06 • Net Asset Value(s) 2006-04-05 • Portfolio Update 2006-04-04 • Net Asset Value(s) 2006-04-04 • Net Asset Value(s) 2006-04-03 • Allotment of shares 2006-04-03 - 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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