Annual Information Update

Henderson High Income Trust PLC 31 March 2006 HENDERSON HIGH INCOME TRUST PLC HENDERSON GLOBAL INVESTORS 31 March 2006 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 30 March 2006 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 Some of the information referred to below was provided as at a specific date and may now be out of date. 30/03/2006 14:28:55 Net Asset Value(s) - HHI 29/03/2006 14:00:25 Net Asset Value(s) - HHI 28/03/2006 14:00:31 Net Asset Value(s) - HHI 28/03/2006 10:48:46 Report & Accounts/Proxy Cards - HHI 27/03/2006 16:00:37 Net Asset Value(s) - HHI 24/03/2006 14:00:22 Net Asset Value(s) - HHI 24/03/2006 13:31:03 Director/PDMR Shareholding - HHI 23/03/2006 14:00:26 Net Asset Value(s) - HHI 22/03/2006 14:00:17 Net Asset Value(s) - HHI 21/03/2006 14:00:18 Net Asset Value(s) - HHI 20/03/2006 16:00:18 Net Asset Value(s) - HHI 17/03/2006 14:19:31 Net Asset Value(s) - HHI 16/03/2006 14:00:29 Net Asset Value(s) - HHI 16/03/2006 09:06:21 Monthly Fact Sheet - HHI 15/03/2006 14:00:27 Net Asset Value(s) - HHI 14/03/2006 14:00:30 Net Asset Value(s) - HHI 13/03/2006 16:00:17 Net Asset Value(s) - HHI 10/03/2006 14:00:21 Net Asset Value(s) - HHI 09/03/2006 14:00:30 Net Asset Value(s) - HHI 08/03/2006 15:55:06 Final Results - HHI 08/03/2006 14:00:33 Net Asset Value(s) - HHI 07/03/2006 14:00:22 Net Asset Value(s) - HHI 06/03/2006 16:15:19 Net Asset Value(s) - HHI 03/03/2006 14:00:15 Net Asset Value(s) - HHI 02/03/2006 14:00:19 Net Asset Value(s) - HHI 28/02/2006 14:00:39 Net Asset Value(s) - HHI 27/02/2006 16:00:25 Net Asset Value(s) - HHI 24/02/2006 14:00:17 Net Asset Value(s) - HHI 23/02/2006 14:00:18 Net Asset Value(s) - HHI 22/02/2006 14:00:17 Net Asset Value(s) - HHI 21/02/2006 14:00:17 Net Asset Value(s) - HHI 20/02/2006 16:00:20 Net Asset Value(s) - HHI 20/02/2006 11:38:40 Monthly Fact Sheet - HHI 17/02/2006 14:00:30 Net Asset Value(s) - HHI 16/02/2006 16:52:09 Allotment of Shares - HHI 16/02/2006 14:00:26 Net Asset Value(s) - HHI 15/02/2006 14:00:27 Net Asset Value(s) - HHI 14/02/2006 14:00:24 Net Asset Value(s) - HHI 13/02/2006 16:00:36 Net Asset Value(s) - HHI 10/02/2006 14:00:18 Net Asset Value(s) - HHI 09/02/2006 14:00:19 Net Asset Value(s) - HHI 08/02/2006 16:40:38 Allotment of shares - HHI 08/02/2006 14:00:16 Net Asset Value(s) - HHI 07/02/2006 14:00:21 Net Asset Value(s) - HHI 06/02/2006 17:04:31 Allotment of Shares - HHI 06/02/2006 16:00:54 Net Asset Value(s) - HHI 03/02/2006 14:00:26 Net Asset Value(s) - HHI 02/02/2006 14:00:17 Net Asset Value(s) - HHI 31/01/2006 14:00:17 Net Asset Value(s) - HHI 30/01/2006 16:18:23 Net Asset Value(s) - HHI 27/01/2006 14:00:28 Net Asset Value(s) - HHI 26/01/2006 14:00:18 Net Asset Value(s) - HHI 25/01/2006 14:09:54 Net Asset Value(s) - HHI 24/01/2006 14:00:11 Net Asset Value(s) - HHI 23/01/2006 17:24:33 Net Asset Value(s) - HHI 20/01/2006 14:00:21 Net Asset Value(s) - HHI 19/01/2006 14:00:13 Net Asset Value(s) - HHI 18/01/2006 15:57:12 Monthly Fact Sheet - HHI 18/01/2006 14:00:14 Net Asset Value(s) - HHI 17/01/2006 14:00:11 Net Asset Value(s) - HHI 16/01/2006 16:45:06 Net Asset Value(s) - HHI 13/01/2006 14:00:16 Net Asset Value(s) - HHI 12/01/2006 14:00:14 Net Asset Value(s) - HHI 11/01/2006 14:00:12 Net Asset Value(s) - HHI 10/01/2006 14:00:10 Net Asset Value(s) - HHI 09/01/2006 16:00:11 Net Asset Value(s) - HHI 06/01/2006 14:00:11 Net Asset Value(s) - HHI 05/01/2006 14:00:08 Net Asset Value(s) - HHI 05/01/2006 11:24:30 Blocklisting Interim Review - HHI 04/01/2006 14:00:19 Net Asset Value(s) - HHI 04/01/2006 13:40:32 Portfolio Update - HHI 03/01/2006 16:00:10 Net Asset Value(s) - HHI 29/12/2005 14:00:07 Net Asset Value(s) - HHI 28/12/2005 14:00:10 Net Asset Value(s) - HHI 22/12/2005 14:00:30 Net Asset Value(s) - HHI 21/12/2005 14:00:12 Net Asset Value(s) - HHI 20/12/2005 14:00:17 Net Asset Value(s) - HHI 19/12/2005 16:00:14 Net Asset Value(s) - HHI 16/12/2005 14:00:03 Net Asset Value(s) - HHI 16/12/2005 12:42:37 Monthly Fact Sheet - HHI 15/12/2005 14:00:13 Net Asset Value(s) - HHI 14/12/2005 16:20:41 Net Asset Value(s) - HHI 13/12/2005 14:00:18 Net Asset Value(s) - HHI 12/12/2005 16:00:13 Net Asset Value(s) - HHI 12/12/2005 14:18:55 Allotment of Shares - HHI 09/12/2005 14:00:19 Net Asset Value(s) - HHI 08/12/2005 14:00:18 Net Asset Value(s) - HHI 07/12/2005 14:00:12 Net Asset Value(s) - HHI 06/12/2005 14:00:16 Net Asset Value(s) - HHI 05/12/2005 16:26:52 Net Asset Value(s) - HHI 02/12/2005 16:38:58 Allotment of Shares - HHI 02/12/2005 14:14:06 Net Asset Value(s) - HHI 30/11/2005 14:00:21 Net Asset Value(s) - HHI 29/11/2005 14:00:12 Net Asset Value(s) - HHI 28/11/2005 16:15:12 Net Asset Value(s) - HHI 25/11/2005 14:00:16 Net Asset Value(s) - HHI 24/11/2005 14:17:02 Net Asset Value(s) - HHI 23/11/2005 14:00:17 Net Asset Value(s) - HHI 22/11/2005 14:00:14 Net Asset Value(s) - HHI 21/11/2005 16:13:33 Net Asset Value(s) - HHI 18/11/2005 14:00:15 Net Asset Value(s) - HHI 17/11/2005 14:00:18 Net Asset Value(s) - HHI 16/11/2005 16:33:39 Monthly Fact Sheet - HHI 16/11/2005 16:29:26 Allotment of Shares - HHI 16/11/2005 15:08:50 Dividend Declaration - HHI 16/11/2005 14:00:22 Net Asset Value(s) - HHI 15/11/2005 14:00:19 Net Asset Value(s) - HHI 14/11/2005 16:41:37 Net Asset Value(s) - HHI 11/11/2005 14:13:58 Net Asset Value(s) - HHI 10/11/2005 14:00:11 Net Asset Value(s) - HHI 09/11/2005 17:22:24 Director/PDMR Shareholding - HHI 09/11/2005 14:00:11 Net Asset Value(s) - HHI 08/11/2005 14:00:13 Net Asset Value(s) - HHI 07/11/2005 16:15:09 Net Asset Value(s) - HHI 04/11/2005 14:00:07 Net Asset Value(s) - HHI 03/11/2005 14:00:18 Net Asset Value(s) - HHI 02/11/2005 14:00:14 Net Asset Value(s) - HHI 31/10/2005 16:00:13 Net Asset Value(s) - HHI 28/10/2005 14:00:11 Net Asset Value(s) - HHI 27/10/2005 14:00:16 Net Asset Value(s) - HHI 26/10/2005 14:00:09 Net Asset Value(s) - HHI 25/10/2005 14:00:03 Net Asset Value(s) - HHI 24/10/2005 16:01:31 Net Asset Value(s) - HHI 21/10/2005 15:28:10 Monthly Fact Sheet - HHI 21/10/2005 15:26:34 Monthly Fact Sheet - HHI 21/10/2005 14:02:59 Net Asset Value(s) - HHI 20/10/2005 14:05:08 Net Asset Value(s) - HHI 19/10/2005 14:00:18 Net Asset Value(s) - HHI 18/10/2005 14:00:17 Net Asset Value(s) - HHI 17/10/2005 16:00:14 Net Asset Value(s) - HHI 14/10/2005 14:00:09 Net Asset Value(s) - HHI 13/10/2005 14:00:10 Net Asset Value(s) - HHI 12/10/2005 14:00:14 Net Asset Value(s) - HHI 11/10/2005 14:00:15 Net Asset Value(s) - HHI 10/10/2005 16:00:08 Net Asset Value(s) - HHI 07/10/2005 14:00:08 Net Asset Value(s) - HHI 06/10/2005 14:00:12 Net Asset Value(s) - HHI 05/10/2005 14:00:10 Net Asset Value(s) - HHI 05/10/2005 12:15:16 Holding(s) in Company - HHI 04/10/2005 16:49:14 Portfolio Update - HHI 04/10/2005 14:00:11 Net Asset Value(s) - HHI 03/10/2005 16:00:15 Net Asset Value(s) - HHI 30/09/2005 14:00:21 Net Asset Value(s) - HHI 29/09/2005 14:00:13 Net Asset Value(s) - HHI 28/09/2005 14:00:17 Net Asset Value(s) - HHI 27/09/2005 18:05:38 Issue of Equity - HHI 27/09/2005 14:00:15 Net Asset Value(s) - HHI 26/09/2005 16:09:20 Net Asset Value(s) - HHI 23/09/2005 14:00:13 Net Asset Value(s) - HHI 23/09/2005 10:34:26 Result of EGM - HHI 22/09/2005 14:00:09 Net Asset Value(s) - HHI 21/09/2005 14:24:45 Net Asset Value(s) - HHI 20/09/2005 14:00:16 Net Asset Value(s) - HHI 19/09/2005 16:04:05 Net Asset Value(s) - HHI 16/09/2005 14:00:09 Net Asset Value(s) - HHI 15/09/2005 16:50:04 Monthly Fact Sheet - HHI 15/09/2005 14:01:56 Net Asset Value(s) - HHI 14/09/2005 14:00:14 Net Asset Value(s) - HHI 13/09/2005 14:00:16 Net Asset Value(s) - HHI 12/09/2005 16:15:06 Net Asset Value(s) - HHI 09/09/2005 14:00:14 Net Asset Value(s) - HHI 08/09/2005 14:13:23 Net Asset Value(s) - HHI 07/09/2005 14:00:15 Net Asset Value(s) - HHI 06/09/2005 14:00:17 Net Asset Value(s) - HHI 05/09/2005 16:00:17 Net Asset Value(s) - HHI 02/09/2005 14:00:13 Net Asset Value(s) - HHI 31/08/2005 14:00:13 Net Asset Value(s) - HHI 30/08/2005 16:00:06 Net Asset Value(s) - HHI 30/08/2005 11:43:57 Document Viewing Facility - HHI 26/08/2005 14:44:28 Placing & Offer - HHI 26/08/2005 14:00:08 Net Asset Value(s) - HHI 25/08/2005 14:00:12 Net Asset Value(s) - HHI 24/08/2005 14:00:10 Net Asset Value(s) - HHI 23/08/2005 14:00:09 Net Asset Value(s) - HHI 22/08/2005 16:00:07 Net Asset Value(s) - HHI 19/08/2005 14:39:11 Monthly Fact Sheet - HHI 19/08/2005 14:00:15 Net Asset Value(s) - HHI 18/08/2005 14:00:12 Net Asset Value(s) - HHI 17/08/2005 14:00:10 Net Asset Value(s) - HHI 16/08/2005 14:00:12 Net Asset Value(s) - HHI 15/08/2005 16:00:07 Net Asset Value(s) - HHI 12/08/2005 15:35:17 Interim Report and Accounts - HHI 12/08/2005 14:00:11 Net Asset Value(s) - HHI 11/08/2005 14:00:14 Net Asset Value(s) - HHI 10/08/2005 14:00:11 Net Asset Value(s) - HHI 09/08/2005 14:00:13 Net Asset Value(s) - HHI 08/08/2005 16:00:08 Net Asset Value(s) - HHI 05/08/2005 14:00:11 Net Asset Value(s) - HHI 04/08/2005 14:00:15 Net Asset Value(s) - HHI 03/08/2005 14:00:21 Net Asset Value(s) - HHI 03/08/2005 13:51:41 Director/PDMR Shareholding - HHI 02/08/2005 14:28:56 Net Asset Value(s) - HHI 01/08/2005 16:15:05 Net Asset Value(s) - HHI 29/07/2005 14:00:42 Net Asset Value(s) - HHI 28/07/2005 14:00:22 Net Asset Value(s) - HHI 28/07/2005 07:00:38 Interim Results - HHI 27/07/2005 14:00:13 Net Asset Value(s) - HHI 26/07/2005 14:00:08 Net Asset Value(s) - HHI 25/07/2005 16:02:51 Net Asset Value(s) - HHI 22/07/2005 14:00:08 Net Asset Value(s) - HHI 21/07/2005 16:24:51 Monthly Fact Sheet - HHI 21/07/2005 14:00:09 Net Asset Value(s) - HHI 20/07/2005 14:00:07 Net Asset Value(s) - HHI 19/07/2005 14:00:07 Net Asset Value(s) - HHI 18/07/2005 16:00:10 Net Asset Value(s) - HHI 15/07/2005 14:00:11 Net Asset Value(s) - HHI 14/07/2005 14:00:06 Net Asset Value(s) - HHI 13/07/2005 14:00:07 Net Asset Value(s) - HHI 12/07/2005 14:00:08 Net Asset Value(s) - HHI 11/07/2005 16:00:05 Net Asset Value(s) - HHI 07/07/2005 14:00:15 Net Asset Value(s) - HHI 06/07/2005 14:00:10 Net Asset Value(s) - HHI 05/07/2005 14:00:11 Net Asset Value(s) - HHI 04/07/2005 17:50:25 Net Asset Value(s) - HHI 04/07/2005 17:19:58 Listing Rule 15.4.10(2) - HHI 04/07/2005 14:24:21 Blocklisting Interim Review - HHI 30/06/2005 14:38:15 Net Asset Value(s) - HHI 29/06/2005 14:00:14 Net Asset Value(s) - HHI 28/06/2005 14:00:17 Net Asset Value(s) - HHI 27/06/2005 16:00:09 Net Asset Value(s) - HHI 24/06/2005 14:00:19 Net Asset Value(s) - HHI 23/06/2005 14:00:08 Net Asset Value(s) - HHI 22/06/2005 14:00:08 Net Asset Value(s) - HHI 22/06/2005 10:20:36 Monthly Fact Sheet - HHI 21/06/2005 14:00:09 Net Asset Value(s) - HHI 20/06/2005 16:20:05 Net Asset Value(s) - HHI 17/06/2005 14:02:16 Net Asset Value(s) - HHI 15/06/2005 14:00:03 Net Asset Value(s) - HHI 14/06/2005 14:00:11 Net Asset Value(s) - HHI 13/06/2005 16:00:06 Net Asset Value(s) - HHI 10/06/2005 14:00:13 Net Asset Value(s) - HHI 09/06/2005 14:00:09 Net Asset Value(s) - HHI 08/06/2005 14:00:12 Net Asset Value(s) - HHI 07/06/2005 16:28:28 Monthly Fact Sheet - HHI 07/06/2005 14:00:06 Net Asset Value(s) - HHI 06/06/2005 16:00:05 Net Asset Value(s) - HHI 03/06/2005 14:08:29 Net Asset Value(s) - HHI 02/06/2005 14:00:07 Net Asset Value(s) - HHI 31/05/2005 16:17:41 Net Asset Value(s) - HHI 27/05/2005 14:57:10 Net Asset Value(s) - HHI 26/05/2005 14:00:10 Net Asset Value(s) - HHI 25/05/2005 14:00:14 Net Asset Value(s) - HHI 24/05/2005 14:00:14 Net Asset Value(s) - HHI 23/05/2005 16:00:06 Net Asset Value(s) - HHI 20/05/2005 14:13:50 Net Asset Value(s) - HHI 19/05/2005 16:53:31 Director Shareholding - HHI 19/05/2005 14:00:10 Net Asset Value(s) - HHI 18/05/2005 14:00:06 Net Asset Value(s) - HHI 16/05/2005 16:01:19 Net Asset Value(s) - HHI 13/05/2005 14:16:51 Net Asset Value(s) - HHI 12/05/2005 14:00:09 Net Asset Value(s) - HHI 11/05/2005 14:00:09 Net Asset Value(s) - HHI 10/05/2005 14:00:11 Net Asset Value(s) - HHI 09/05/2005 16:01:11 Net Asset Value(s) - HHI 06/05/2005 14:39:35 Net Asset Value(s) - HHI 05/05/2005 14:00:09 Net Asset Value(s) - HHI 04/05/2005 14:44:54 Director Shareholding - HHI 04/05/2005 14:00:09 Net Asset Value(s) - HHI 03/05/2005 16:00:05 Net Asset Value(s) - HHI 29/04/2005 11:35:13 Net Asset Value(s) - HHI 28/04/2005 14:00:12 Net Asset Value(s) - HHI 27/04/2005 15:29:42 Result of AGM - HHI 27/04/2005 15:26:28 Dividend Declaration - HHI 27/04/2005 14:24:17 Net Asset Value(s) - HHI 26/04/2005 14:00:10 Net Asset Value(s) - HHI 25/04/2005 16:00:07 Net Asset Value(s) - HHI 22/04/2005 14:00:02 Net Asset Value(s) - HHI 21/04/2005 14:00:05 Net Asset Value(s) - HHI 20/04/2005 14:00:08 Net Asset Value(s) - HHI 15/04/2005 16:12:55 Monthly Fact Sheet - HHI 14/04/2005 14:00:06 Net Asset Value(s) - HHI 13/04/2005 14:00:08 Net Asset Value(s) - HHI 12/04/2005 14:00:08 Net Asset Value(s) - HHI 11/04/2005 16:00:07 Net Asset Value(s) - HHI 08/04/2005 14:00:09 Net Asset Value(s) - HHI 07/04/2005 14:00:08 Net Asset Value(s) - HHI 06/04/2005 14:00:08 Net Asset Value(s) - HHI 05/04/2005 14:00:09 Net Asset Value(s) - HHI 04/04/2005 16:15:06 Net Asset Value(s) - HHI 04/04/2005 15:59:31 Listing Rule 21 - HHI 31/03/2005 14:00:09 Net Asset Value(s) - HHI - 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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