(19)

(11)

EP 1 078 131 A1

(12)

(43) Date of publication: 28.02.2001 Bulletin 2001/09 (21) Application number: 99920950.5 (22) Date of filing: 07.05.1999

(51) International Patent Classification (IPC)7: E02D 29/14 (86) International application number: PCT/GB9901/231 (87) International publication number: WO 9958/770 (18.11.1999 Gazette 1999/46)

(84) Designated Contracting States: DE FR GB (30) Priority: 09.05.1998 GB 9809909 (71) Applicant: Howe Green Limited Hertford, Hertfordshire SG13 7BH (GB)	(72) Inventor: CENTA, Antony Richard Hertford,Hertfordshire SG13 8LH (GB) (74) Representative: Maury, Richard Philip et al Sommerville & Rushton,45 Grosvenor Road St. Albans, Herts AL1 3AW St. Albans, Herts AL1 3AW (GB)