(19)

(11)

EP 0 880 592 A2

(12)

(43) Date of publication: 02.12.1998 Bulletin 1998/49 (21) Application number: 97900294.0 (22) Date of filing: 09.01.1997

(51) International Patent Classification (IPC):  A01H 1/ 00( . ) C12N 15/ 09( . ) A01H 1/ 06( . ) C12N 15/ 82( . ) (86) International application number: PCT/GB1997/000042 (87) International publication number: WO 1997/025434 (17.07.1997 Gazette 1997/31)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 13.01.1996 GB 19960000698 (71) Applicant: ADVANCED TECHNOLOGIES (CAMBRIDGE) LIMITED Staines, Middlesex TW18 1DY (GB)	(72) Inventors: MAUNDERS, Martin, Jack Ely, Cambridgeshire CB6 2SN (GB) RICHARDSON, Peter Cambridge, Cambridgeshire CB4 6ZQ (GB) (74) Representative: Walford, Margot Ruth, et al  Patents Department, British-American Tobacco Co. Ltd., Technology Centre, Regents Park Road Southampton SO15 8TL Southampton SO15 8TL (GB)