(19)

(11)

EP 0 865 542 A1

(12)

(43) Date of publication: 23.09.1998 Bulletin 1998/39 (21) Application number: 96941109.0 (22) Date of filing: 29.11.1996

(51) International Patent Classification (IPC):  E02D 29/ 14( . ) (86) International application number: PCT/GB1996/002973 (87) International publication number: WO 1997/022760 (26.06.1997 Gazette 1997/27)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 16.12.1995 GB 19950025790 (71) Applicant: Envirolite Holdings Limited Great Dunmow, Essex CM6 1AF (GB)	(72) Inventor: WARDELL, Jeffrey Robert Stansted, Essex CM24 8JA (GB) (74) Representative: Gillam, Francis Cyril, et al  SANDERSON & CO. 34, East Stockwell Street Colchester Essex CO1 1ST Colchester Essex CO1 1ST (GB)