(19)

(11)

EP 0 227 780 A1

(12)

(43) Date of publication: 08.07.1987 Bulletin 1987/28 (21) Application number: 86904267.0 (22) Date of filing: 30.06.1986

(51) International Patent Classification (IPC):  F01L 1/ 16( . ) F01L 1/ 46( . ) (86) International application number: PCT/GB1986/000382 (87) International publication number: WO 1987/000238 (15.01.1987 Gazette 1987/01)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 03.07.1985 GB 19850016859 (71) Applicant: The Secretary of State for Trade and Industry in Her Britannic Majesty's Government of the United Kingdom of Great Britain and London SW1H OET (GB)	(72) Inventors: RUDHAM, Robert, Cedric Abingdon Oxon OX14 1DL (GB) McCARTHY, John, Charles Oxfordshire OX010 9LG (GB)