(19)

(11)

EP 1 504 570 A1

(12)

(43) Date of publication: 09.02.2005 Bulletin 2005/06 (21) Application number: 03725342.4 (22) Date of filing: 25.04.2003

(51) International Patent Classification (IPC)7: H04L 12/28 (86) International application number: PCT/GB2003/001770 (87) International publication number: WO 2003/096625 (20.11.2003 Gazette 2003/47)

(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: 11.05.2002 GB 0210857 (71) Applicant: CEDARDELL LIMITED Hexam, Northumberland NE46 5SN (GB)	(72) Inventor: TODD, Robert Edmund Northumberland NE24 2PP (GB) (74) Representative: Vinsome, Rex Martin  Urquhart-Dykes & Lord LLPSt Nicholas Chambers,Amen Corner Newcastle-Upon-Tyne NE1 1PE Newcastle-Upon-Tyne NE1 1PE (GB)