Just checked the crank sensor gap and its 0.7mm, plugs are a bit wet but they are firing (gaps about 0.6mm), not checked the phase sensor yet. I'm sure it's got to be something timing related as the engine always stops with a crankshaft pulley marker exactly over the crank sensor. It does fire once or twice and sounds like its about to start then just stops as if its firing out of sequence or at the wrong time, bound to be something simple but I'm stuck!