(19)

(11)

EP 1 620 606 A1

(12)

(43) Date of publication: 01.02.2006 Bulletin 2006/05 (21) Application number: 04727603.5 (22) Date of filing: 15.04.2004

(51) International Patent Classification (IPC):  E01B 19/00(1968.09) (86) International application number: PCT/GB2004/001608 (87) International publication number: WO 2004/097115 (11.11.2004 Gazette 2004/46)

(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 PL PT RO SE SI SK TR (30) Priority: 30.04.2003 GB 0309795 (71) Applicant: Corus UK Limited London SW1P 4WY (GB)	(72) Inventor: FARRINGTON, David Penrith CA10 3AS (GB) (74) Representative: Evans, Claire et al Fry Heath & Spence LLP The Gables, Massetts Road Horley, Surrey RH6 7DQ Horley, Surrey RH6 7DQ (GB)