(19)

(11)

EP 1 252 398 A1

(12)

(43) Date of publication: 30.10.2002 Bulletin 2002/44 (21) Application number: 01949017.6 (22) Date of filing: 02.02.2001

(51) International Patent Classification (IPC)7: E02D 29/02 (86) International application number: PCT/GB0100/443 (87) International publication number: WO 0105/7323 (09.08.2001 Gazette 2001/32)

(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: 04.02.2000 GB 0002676 (71) Applicant: PHI Group Limited Cheltenham,Gloucestershire GL50 3DA (GB)	(72) Inventors: O'BRIEN, Gerald Gloucestershire GL52 5DQ (GB) WILKINSON, John Berkshire SL5 9JY (GB) (74) Representative: Laight, Martin Harvey et al W.H. Beck, Greener & Co.7 Stone BuildingsLincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)