(19)

(11)

EP 0 283 499 A1

(12)

(43) Date of publication: 28.09.1988 Bulletin 1988/39 (21) Application number: 87906302.0 (22) Date of filing: 25.09.1987

(51) International Patent Classification (IPC):  G09B 29/ 06( . ) (86) International application number: PCT/GB1987/000681 (87) International publication number: WO 1988/002529 (07.04.1988 Gazette 1988/08)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 25.09.1986 GB 19860023035 22.05.1987 GB 19870012150 (71) Applicant: GAINSBOROUGH HOLDINGS LIMITED London SW11 4NB (GB)	(72) Inventors: RENNIE, John, Marshall Sussex PO20 7HH (GB) MONKS, Anthony Redhill, Surrey (GB) (74) Representative: Deans, Michael John Percy, et al  Lloyd Wise, Tregear & CO. Norman House 105-109 Strand London WC2R OAE London WC2R OAE (GB)