(19)

(11)

EP 2 137 355 A1

(12)

(43) Date of publication: 30.12.2009 Bulletin 2009/53 (21) Application number: 08718798.5 (22) Date of filing: 18.03.2008

(51) International Patent Classification (IPC):  E03F 5/22(2006.01) (86) International application number: PCT/GB2008/000959 (87) International publication number: WO 2008/119933 (09.10.2008 Gazette 2008/41)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (30) Priority: 29.03.2007 GB 0706969 (71) Applicant: Retroflo Limited Tyne & Wear NE11 0JQ (GB)	(72) Inventor: LAUNDON, Andy Tyne & Wear NE11 0JQ (GB) (74) Representative: Wilson Gunn  5th Floor Blackfriars House The Parsonage Manchester M3 2JA Manchester M3 2JA (GB)