(19)

(11)

EP 1 945 862 A1

(12)

(43) Date of publication: 23.07.2008 Bulletin 2008/30 (21) Application number: 06794768.9 (22) Date of filing: 13.10.2006

(51) International Patent Classification (IPC):  E02D 5/40(2006.01) E02D 27/52(2006.01) (86) International application number: PCT/GB2006/003822 (87) International publication number: WO 2007/042830 (19.04.2007 Gazette 2007/16)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 14.10.2005 GB 0520891 28.11.2005 GB 0524132 (71) Applicant: TRIDAL GENERATION LIMITED Bristol Bristol BS1 5UB (GB)	(72) Inventors: GIBBERD, George Bristol Bristol BS8 4SH (GB) HUXLEY-REYNARD, Christopher Bristol Bristol BS7 8RY (GB) (74) Representative: Vigars, Christopher Ian et al ElementOne IP Limited St Nicholas House 31-34 High Street Bristol BS1 2AW Bristol BS1 2AW (GB)