(19)

(11)

EP 1 789 632 A1

(12)

(43) Date of publication: 30.05.2007 Bulletin 2007/22 (21) Application number: 05777581.9 (22) Date of filing: 05.09.2005

(51) International Patent Classification (IPC):  E01C 9/08(2006.01) E01D 15/12(2006.01) E01D 15/20(2006.01) (86) International application number: PCT/GB2005/003413 (87) International publication number: WO 2006/027559 (16.03.2006 Gazette 2006/11)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 10.09.2004 GB 0420174 20.06.2005 GB 0512490 (71) Applicant: QINETIQ LIMITED 85 Buckingham Gate London SW1E 6PD (GB)	(72) Inventors: Connor, Richard Charles Christchurch, Dorset BH23 2BN (GB) Gray, Nathan Michael Farnborough, Hampshire GU14 0LX (GB) (74) Representative: Obee, Robert William  QinetiQ Limited Intellectual Property, Cody Technology Park, Ively Road Farnborough, Hants GU14 0LX Farnborough, Hants GU14 0LX (GB)