(19)

(11)

EP 0 649 551 A1

(12)

(43) Date of publication: 26.04.1995 Bulletin 1995/17 (21) Application number: 93916043.0 (22) Date of filing: 09.07.1993

(51) International Patent Classification (IPC):  G08B 13/ 14( . ) (86) International application number: PCT/GB1993/001438 (87) International publication number: WO 1994/001843 (20.01.1994 Gazette 1994/03)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 09.07.1992 GB 19920014600 (71) Applicants: CONNER, Peter Stoke Gifford, Bristol BS12 6UL (GB) CAREY, Patrick Hugh Kingswood, Bristol BS15 1PL (GB)	(72) Inventor: CAREY, Patrick Hugh Kingswood, Bristol BS15 1PL (GB) (74) Representative: O'Connell, David Christopher  HASELTINE LAKE & CO. Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)