(19)

(11)

EP 0 658 231 A1

(12)

(43) Date of publication: 21.06.1995 Bulletin 1995/25 (21) Application number: 94908846.0 (22) Date of filing: 24.08.1993

(51) International Patent Classification (IPC):  E02D 31/ 00( . ) (86) International application number: PCT/GB1993/001807 (87) International publication number: WO 1994/005863 (17.03.1994 Gazette 1994/07)

(84) Designated Contracting States: BE DE DK FR GB IE NL (30) Priority: 26.08.1992 GB 19920018178 10.05.1993 GB 19930009586 (71) Applicant: RAWELL GROUP HOLDINGS LIMITED Hyolake, Merseyside L47 4AZ (GB)	(72) Inventors: FLYNN, Bryan Nicholas Heswall, Merseyside L6 2UV (GB) CARTER, Glyn Corbett Ellesmere Port, South Wirral L65 5AL (GB) (74) Representative: Kelvie, George Thomas  Urquhart-Dykes & Lord The Victoria Suite 3rd Floor Northern Assurance Buildings Albert Square Manchester M2 4DN Manchester M2 4DN (GB)