(19)

(11)

EP 1 192 435 A1

(12)

(43) Date of publication: 03.04.2002 Bulletin 2002/14 (21) Application number: 00942256.9 (22) Date of filing: 03.07.2000

(51) International Patent Classification (IPC)7: G01M 3/36 (86) International application number: PCT/GB0002/555 (87) International publication number: WO 0102/825 (11.01.2001 Gazette 2001/02)

(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: 01.07.1999 GB 9915391 (71) Applicant: BWI plc Altrincham,Cheshire WA14 5EW (GB)	(72) Inventor: BOYLE, Richard, John Woking,Surrey GU21 3LB (GB) (74) Representative: Enskat, Michael Antony Frank et al Saunders & Dolleymore,9, Rickmansworth Road Watford,Hertfordshire WD18 0JU Watford,Hertfordshire WD18 0JU (GB)