(19)

(11)

EP 1 224 517 A1

(12)

(43) Date of publication: 24.07.2002 Bulletin 2002/30 (21) Application number: 00962697.9 (22) Date of filing: 21.09.2000

(51) International Patent Classification (IPC)7: G06F 1/00, G06F 12/14 (86) International application number: PCT/GB0003/620 (87) International publication number: WO 0125/882 (12.04.2001 Gazette 2001/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 04.10.1999 GB 9923340 (71) Applicant: Qinetiq Limited London, SW1 6TD (GB)	(72) Inventors: SIMPSON, Gary Steven Worcestershire WR14 3PS (GB) DEAN, Timothy Barry Worcestershire WR14 3PS (GB) (74) Representative: Williams, Arthur Wyn Spencer  D/IP QinetiQ Formalities,A4 Bldg,Ively Road Farnborough,Hampshire GU14 0LX Farnborough,Hampshire GU14 0LX (GB)