(19)

(11)

EP 1 243 002 A1

(12)

(43) Date of publication: 25.09.2002 Bulletin 2002/39 (21) Application number: 00977734.3 (22) Date of filing: 24.11.2000

(51) International Patent Classification (IPC)7: G21K 1/06, G21K 1/10 (86) International application number: PCT/GB0004/494 (87) International publication number: WO 0103/9210 (31.05.2001 Gazette 2001/22)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 24.11.1999 GB 9927631 26.07.2000 GB 0018332 (71) Applicant: BTG International Limited London EC4M 7SB (GB)	(72) Inventors: Michette, Alan George Strand WC2R 2LS (GB) Prewett, Philip D.,The University of Birmingham Edgbaston,Birmingham B15 2TT (GB) (74) Representative: Clarke, Gavin Richard Houghton et al BTG International Ltd10 Fleet Place,Limeburner Lane London EC4M 7SB London EC4M 7SB (GB)