(19)

(11)

EP 2 467 227 A2

(12)

(88) Date of publication A3: 21.04.2011 (43) Date of publication: 27.06.2012 Bulletin 2012/26 (21) Application number: 10805817.3 (22) Date of filing: 10.08.2010

(51) International Patent Classification (IPC):  B23C 3/12(2006.01) (86) International application number: PCT/GB2010/051322 (87) International publication number: WO 2011/021026 (24.02.2011 Gazette 2011/08)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 17.08.2009 GB 0914279 17.08.2009 EP 09275059 (71) Applicant: BAE Systems PLC London SW1Y 5AD (GB)	(72) Inventor: BLOWER, Harry Lancashire BB2 7LF (GB) (74) Representative: BAE SYSTEMS plc Group IP Department  Farnborough Aerospace Centre Farnborough Hampshire GU14 6YU Farnborough Aerospace Centre Farnborough Hampshire GU14 6YU (GB)