(19)

(11)

EP 0 625 227 A1

(12)

(43) Date of publication: 23.11.1994 Bulletin 1994/47 (21) Application number: 93904167.0 (22) Date of filing: 05.02.1993

(51) International Patent Classification (IPC):  E02D 31/ 00( . ) (86) International application number: PCT/GB1993/000246 (87) International publication number: WO 1993/016237 (19.08.1993 Gazette 1993/20)

(84) Designated Contracting States: AT BE DE DK FR IE NL (30) Priority: 07.02.1992 GB 19920002640 (71) Applicant: CORDEK LIMITED Billinghurst, West Sussex RH14 9EY (GB)	(72) Inventor: OLIVER, William Robert Ventnor, Isle of Wight PO38 3AG (GB) (74) Representative: Bardo, Julian Eason  Abel & Imray Northumberland House 303-306 High Holborn London, WC1V 7LH London, WC1V 7LH (GB)