(19)

(11)

EP 0 928 282 A1

(12)

(43) Date of publication: 14.07.1999 Bulletin 1999/28 (21) Application number: 97940029.0 (22) Date of filing: 25.07.1997

(51) International Patent Classification (IPC):  G01F 11/ 02( . ) (86) International application number: PCT/EP1997/004056 (87) International publication number: WO 1998/004494 (05.02.1998 Gazette 1998/05)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 26.07.1996 GB 19960015748 (71) Applicant: The Boots Company PLC Nottingham, Nottinghamshire NG2 3AA (GB)	(72) Inventor: BAKER, Ian James, The Boots Company plc Nottingham NG2 3AA (GB) (74) Representative: Thacker, Michael Anthony, et al  The Boots Company plc Group Patents Department, D31, 1 Thane Road West Nottingham NG2 3AA Nottingham NG2 3AA (GB)