Vauxhall vectra b model.non starter?

Hi i have a 2000 model vauxhall vectra b model, recently it cut out and didnt want to start again,i checked there was enough fuel , a good spark and also put new plugs in, it turns over as it should but wont fire , we tried tow starting it and it stated up quickly i drove it 2 miles and then back home, turned it off and same problem, would not start on key , just turns over but wont start , and doesnt seem to fire up. When its running its sweet and drives great, Any ideas please, Andy Bournemouth.