(19)

(11)

EP 0 823 952 A1

(12)

(43) Date of publication: 18.02.1998 Bulletin 1998/08 (21) Application number: 97905311.0 (22) Date of filing: 28.02.1997

(51) International Patent Classification (IPC):  E02D 5/ 80( . ) (86) International application number: PCT/GB1997/000571 (87) International publication number: WO 1997/032088 (04.09.1997 Gazette 1997/38)

(84) Designated Contracting States: DE GB (30) Priority: 29.02.1996 GB 19960004298 (71) Applicant: Metpost Limited Cardiff CF3 8EX (GB)	(72) Inventors: HENSON, Timothy West Midlands WS9 0YR (GB) LANE, Thomas Dorset BH23 2PG (GB) TANDY, Malcolm Gwent NP6 1QS (GB) (74) Representative: Brereton, Paul Arthur, et al  REDDIE & GROSE 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)