(19)

(11)

EP 1 937 911 A1

(12)

(43) Date of publication: 02.07.2008 Bulletin 2008/27 (21) Application number: 06779492.5 (22) Date of filing: 20.09.2006

(51) International Patent Classification (IPC):  E04D 13/02(2006.01) E04D 13/147(2006.01) E04D 13/03(2006.01) (86) International application number: PCT/GB2006/003487 (87) International publication number: WO 2007/034171 (29.03.2007 Gazette 2007/13)

(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: 21.09.2005 GB 0519286 (71) Applicant: Viridian Concepts Limited Bassingbourn, Herts SG8 5NT (GB)	(72) Inventors: ELMES, Stuart Cambridge CB3 7PL (GB) TAN, K., T. Cambridge CB4 2DF (GB) DAVIES, Martin Cambridge CB3 7ED (GB) (74) Representative: Style, Kelda Camilla Karen  Page White & Farrer Bedford House John Street London, WC1N 2BF London, WC1N 2BF (GB)