(19)

(11)

EP 0 602 115 A1

(12)

(43) Date of publication: 22.06.1994 Bulletin 1994/25 (21) Application number: 92918547.0 (22) Date of filing: 04.09.1992

(51) International Patent Classification (IPC):  C12M 1/ 34( . ) C12Q 1/ 18( . ) C12Q 1/ 02( . ) G01N 33/ 50( . ) (86) International application number: PCT/GB1992/001618 (87) International publication number: WO 1993/005173 (18.03.1993 Gazette 1993/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL SE (30) Priority: 05.09.1991 GB 19910018981 (71) Applicant: PA Consulting Services Limited London SW1W 9SR (GB)	(72) Inventor: BAINS, William, Arthur Royston Hertfordshire SG8 6BW (GB) (74) Representative: Matthews, Heather Clare  Keith W Nash & Co Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)