Ford Focus won't start after changing injection pump

Hi everyone,

Was wondering if anyone can help me with a problem. About a month ago my ford focus just cut out on me while I was driving, the oil light came on and the engine coil light (don't know if that's the right name!) started flashing. I pulled over and tried to start again but it just turned over and wouldn't start. I got the car towed and the mechanic put in a new cam sensor, timing belt and new diesel injection pump. He had the car running when I came to collect it, and I drove it a short while then stopped to get diesel and it started again no bother. I made a journey of about 100 miles in it and it was grand. Then the next day I go to start it and it just turns over but won't start!

Does anyone have any idea what might be wrong? I'm going to call a mechanic but seeing as I know nothing about cars he could tell me anything and I wouldn't have a clue. I just don't want it to be out of action for another month!!

Thanks!