For anyone experiencing the same annoying issues I had. I can safely say get yourself a quality master cylinder!! Since fitting the LUK MC I've had a flawless clutch. So all this thinking it was slave or flywheel etc was really down to a bad master cylinder. Pay the extra and get a quality part is my advice. Didn't even need to back bleed I simply opened bleed to allow push-fit to slide in nicely, perform one bleed by pushing pedal down, then sealed off the bleed nipple and hey presto!