1.2i SX Not Starting When Cold

I'm currently having problems starting my nova when it's cold, it keeps turning over and over but it won't fire and there seems to be no fuel getting to it.
I've also tried starting it with the air box off and noticed that the injector does not spray any fuel.
Once it's warm it starts first time on the turn of the key and I've noticed from flattening the battery a few times that if you jump it then it starts a bit easier, if not almost straight away.
I'm at a loss as to what it could be and appreciate any ideas as to what's wrong with it.