I don't know on this car, but it sounds very like an issue that affected some Vauxhall Vectras until Vauxhall give in to pressure and sorted it.
On the Vectra, it manifested its self as random starting problems after the car had been left for any length of time (hours rather than days). It turned out that fuel was leaking back down the fuel line into the tank, so air pockets were forming in the fuel rail. You try to start it, the fuel pump pressurises it all, including the air, and it takes a bit to work the air lock through.
Ordinary owners solved the problem in the first instance by fitting a non-return valve on the fuel line just before the injector rail. I think later Vauxhall did this as standard to some of their cars.
Of course that's an entirely different make and model to yours, so may not be the issue in your case.
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