(19)

(11)

EP 1 497 641 A2

(12)

(88) Date of publication A3: 19.02.2004 (43) Date of publication: 19.01.2005 Bulletin 2005/03 (21) Application number: 03747170.3 (22) Date of filing: 23.04.2003

(51) International Patent Classification (IPC)7: G01N 27/90 (86) International application number: PCT/GB2003/001740 (87) International publication number: WO 2003/091722 (06.11.2003 Gazette 2003/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 24.04.2002 GB 0209333 (71) Applicant: Networksuk Ltd Norwich,Norfolk NR13 3DY (GB)	(72) Inventors: HOBBS, Alan Norwich,Norfolk NR13 3AT (GB) COOKE, Robert Norwich,Norfolk NR10 4NP (GB) BARRETT, Alex Norwich,Norfolk NR10 4NP (GB) (74) Representative: Wilson, Peter  William Jones LimitedWillow Lane HouseWillow LaneNorwich Norfolk NR2 1EU Norfolk NR2 1EU (GB)