My Vectra 1.8 Exclusive Won't start!?

sounds like a voltage problem. so can be a poor battery connection or defective battery ( too low a voltage) or even a wring connection issue. did wiring get wet ? has any work been carrie out on car recently|? even a connecting plug to loom can give intermittent connections so essentithey we looking for a wiring / connection issue as most likley causes. failing inability to pinpoint the source we may need to pop it into out locla main dealer for a diagnostic check and rrepair. sadly expensive.