(19)

(11)

EP 1 294 986 A1

(12)

(43) Date of publication: 26.03.2003 Bulletin 2003/13 (21) Application number: 01940843.4 (22) Date of filing: 26.06.2001

(51) International Patent Classification (IPC)7: E01B 9/58 (86) International application number: PCT/GB0102/819 (87) International publication number: WO 0200/1002 (03.01.2002 Gazette 2002/01)

(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: 27.06.2000 GB 0015725 (71) Applicant: Infraco BCV Limited London SW1H 0BD (GB)	(72) Inventors: GOWEN, Michael Ruislip,Middlesex HA4 9EH (GB) RILEY, Peter John Ruislip,Middlesex HA4 9LB (GB) (74) Representative: Smith, Norman Ian et al fJ CLEVELAND 40-43 Chancery Lane London WC2A 1JQ London WC2A 1JQ (GB)