| Date | Source | Headline | |
|---|---|---|---|
| 9th Jan 2012 | 5:16 pm | RNS | Holding(s) in Company |
| 4th Jan 2012 | 3:45 pm | RNS | Holding(s) in Company |
| 3rd Jan 2012 | 12:00 pm | RNS | Holding(s) in Company |
| 20th Dec 2011 | 3:32 pm | RNS | Annual Financial Report |
| 20th Dec 2011 | 3:30 pm | RNS | Director/PDMR Shareholding |
| 20th Dec 2011 | 9:45 am | RNS | Filter Contract Award |
| 2nd Dec 2011 | 11:40 am | RNS | Employee Share Plans |
| 28th Nov 2011 | 5:10 pm | RNS | Holding(s) in Company |
| 23rd Nov 2011 | 7:00 am | RNS | Final Results |
| 16th Nov 2011 | 5:41 pm | RNS | Holding(s) in Company |
| 16th Nov 2011 | 3:38 pm | RNS | Holding(s) in Company |
| 10th Oct 2011 | 7:00 am | RNS | Full Year Trading Update |
| 7th Sep 2011 | 5:45 pm | RNS | Holding(s) in Company |
| 2nd Sep 2011 | 4:10 pm | RNS | Holding(s) in Company |
| 18th Aug 2011 | 7:00 am | RNS | Interim Management Statement |
| 10th Aug 2011 | 7:00 am | RNS | Holding(s) in Company |
| 8th Aug 2011 | 7:00 am | RNS | US Department of Defense contract award |
| 20th Jul 2011 | 10:06 am | RNS | Holding(s) in Company |
| 23rd Jun 2011 | 4:30 pm | RNS | Holding(s) in Company |
| 21st Jun 2011 | 4:39 pm | RNS | Holding(s) in Company |
| 21st Jun 2011 | 10:49 am | RNS | Holding(s) in Company |
| 21st Jun 2011 | 10:45 am | RNS | Holding(s) in Company |
| 17th Jun 2011 | 3:33 pm | RNS | Holding(s) in Company |
| 16th Jun 2011 | 4:09 pm | RNS | Holding(s) in Company |
| 15th Jun 2011 | 11:19 am | RNS | Holding(s) in Company |
| 7th Jun 2011 | 7:00 am | RNS | Director/PDMR Shareholding |
| 23rd May 2011 | 3:40 pm | RNS | Director/PDMR Shareholding |
| 13th May 2011 | 2:24 pm | RNS | Holding(s) in Company |
| 4th May 2011 | 7:00 am | RNS | Half Yearly Report |
| 12th Apr 2011 | 9:45 am | RNS | Notice of Results |
| 28th Mar 2011 | 5:34 pm | RNS | Director/PDMR Shareholding |
| 25th Mar 2011 | 4:52 pm | RNS | Holding(s) in Company |
| 3rd Mar 2011 | 4:02 pm | RNS | Result of AGM |
| 11th Feb 2011 | 10:30 am | RNS | Director/PDMR Shareholding |
| 8th Feb 2011 | 9:00 am | RNS | Blocklisting Interim Review |
| 28th Jan 2011 | 9:15 am | RNS | Holding(s) in Company |
| 28th Jan 2011 | 9:15 am | RNS | Director/PDMR Shareholding |
| 25th Jan 2011 | 7:00 am | RNS | Interim Management Statement |
| 17th Jan 2011 | 9:00 am | RNS | Annual Information Update |
| 7th Jan 2011 | 11:00 am | RNS | Annual Financial Report |
| 3rd Dec 2010 | 3:24 pm | RNS | Employee Share Plans |
| 30th Nov 2010 | 2:49 pm | RNS | Holding(s) in Company |
| 30th Nov 2010 | 10:12 am | RNS | Holding(s) in Company |
| 29th Nov 2010 | 8:27 am | RNS | Holding(s) in Company |
| 24th Nov 2010 | 7:00 am | RNS | Final Results |
| 11th Oct 2010 | 7:00 am | RNS | Year-end Update |
| 1st Oct 2010 | 3:38 pm | RNS | Holding(s) in Company |
| 1st Oct 2010 | 3:35 pm | RNS | Holding(s) in Company |
| 1st Oct 2010 | 3:33 pm | RNS | Holding(s) in Company |
| 30th Sep 2010 | 7:00 am | RNS | Holding(s) in Company |
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