| 09/05/17 | 15:08:58 | 9 May 2017 | | Director/PDMR Shareholding | RNS |
| 05/05/17 | 16:58:33 | 5 May 2017 | | Director/PDMR Shareholding | RNS |
| 02/05/17 | 10:09:39 | 2 May 2017 | | Total Voting Rights | RNS |
| 21/04/17 | 15:07:02 | 21 Apr 2017 | | Holding(s) in Company | RNS |
| 20/04/17 | 17:53:41 | 20 Apr 2017 | | 2017 AGM Results | RNS |
| 20/04/17 | 17:28:03 | 20 Apr 2017 | | Holding(s) in Company | RNS |
| 20/04/17 | 16:03:06 | 20 Apr 2017 | | Director/PDMR Shareholding | RNS |
| 20/04/17 | 08:01:28 | 20 Apr 2017 | | Trading Update | RNS |
| 03/04/17 | 09:45:27 | 3 Apr 2017 | | Holding(s) in Company | RNS |
| 03/04/17 | 09:40:57 | 3 Apr 2017 | | Total Voting Rights | RNS |
| 17/03/17 | 15:22:16 | 17 Mar 2017 | | Notice of AGM | RNS |
| 14/03/17 | 16:07:04 | 14 Mar 2017 | | Holding(s) in Company | RNS |
| 13/03/17 | 17:53:21 | 13 Mar 2017 | | Holding(s) in Company | RNS |
| 08/03/17 | 10:00:38 | 8 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 06/03/17 | 13:00:42 | 6 Mar 2017 | | Completion of Divestment of Porous Technologies | RNS |
| 03/03/17 | 17:00:00 | 3 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 03/03/17 | 14:36:19 | 3 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 03/03/17 | 09:52:43 | 3 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 03/03/17 | 08:53:36 | 3 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 03/03/17 | 07:00:06 | 3 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 02/03/17 | 18:30:03 | 2 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 02/03/17 | 18:03:16 | 2 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 02/03/17 | 17:50:32 | 2 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 02/03/17 | 17:26:30 | 2 Mar 2017 | | Total Voting Rights | RNS |
| 01/03/17 | 15:45:48 | 1 Mar 2017 | | Director/PDMR Shareholding | RNS |
| 27/02/17 | 10:55:06 | 27 Feb 2017 | | Holding(s) in Company | RNS |
| 27/02/17 | 10:14:55 | 27 Feb 2017 | | Holding(s) in Company | RNS |
| 22/02/17 | 17:00:58 | 22 Feb 2017 | | Holding(s) in Company | RNS |
| 21/02/17 | 16:34:18 | 21 Feb 2017 | | Director/PDMR Shareholding | RNS |
| 20/02/17 | 17:53:36 | 20 Feb 2017 | | Holding(s) in Company | RNS |
| 17/02/17 | 07:08:25 | 17 Feb 2017 | | Final Results | RNS |
| 10/02/17 | 16:38:19 | 10 Feb 2017 | | Invitation to Full Year 2016 Results Webcast | RNS |
| 10/02/17 | 14:01:34 | 10 Feb 2017 | | Holding(s) in Company | RNS |
| 30/12/16 | 08:58:45 | 30 Dec 2016 | | Director/PDMR Shareholding | RNS |
| 23/12/16 | 15:21:10 | 23 Dec 2016 | | Director/PDMR Shareholding | RNS |
| 16/12/16 | 16:03:13 | 16 Dec 2016 | | Director/PDMR Shareholding | RNS |
| 12/12/16 | 15:56:35 | 12 Dec 2016 | | Share Transaction | RNS |
| 06/12/16 | 12:52:59 | 6 Dec 2016 | | Peter Hill - External Appointment | RNS |
| 06/12/16 | 07:49:53 | 6 Dec 2016 | | Total Voting Rights | RNS |
| 21/11/16 | 10:53:50 | 21 Nov 2016 | | Holding(s) in Company | RNS |
| 21/11/16 | 07:03:24 | 21 Nov 2016 | | Trading Statement | RNS |
| 07/11/16 | 16:43:10 | 7 Nov 2016 | | Director/PDMR Shareholding | RNS |
| 07/11/16 | 14:17:17 | 7 Nov 2016 | | Director/PDMR Shareholding | RNS |
| 04/11/16 | 18:00:03 | 4 Nov 2016 | | Holding(s) in Company | RNS |
| 03/11/16 | 14:46:59 | 3 Nov 2016 | | Proposed Appointment of External Auditor | RNS |
| 02/11/16 | 15:58:42 | 2 Nov 2016 | | Director/PDMR Shareholding | RNS |
| 01/11/16 | 11:37:08 | 1 Nov 2016 | | Total Voting Rights | RNS |
| 31/10/16 | 07:01:26 | 31 Oct 2016 | | Appointment of New Chief Executive | RNS |
| 10/10/16 | 14:06:46 | 10 Oct 2016 | | Holding(s) in Company | RNS |
| 03/10/16 | 09:11:24 | 3 Oct 2016 | | Total Voting Rights | RNS |
