had another look at this on Saturday, started from cold and it missed on cyl 4 with injector switching and good kv.
removed spark plugs to inspect in cylinders and found water droplets in cyl 4.
took fuel sample and found water in fuel,empty fuel tank/rail and refill with new fuel filter.The water appears to be coming in through the charcoal filter new one fitted.
12 mile road test and all is well.
thanks again norman.
Message Thread 
Vauxhall Corsa C 1.2 16v Z12XEP 2005 - Misfire detection P0300, P0301 & P0304 - Fixed # - Norman Shelmerdine February 11, 2011, 4:57 pm
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