Astra 1.7TD not starting

I have noticed that the glow plug indicator light is not lighting up and the car now won't start. Fuel is getting to the engine and there is no alarm or imobiliser stopping it. I replaced the glow plugs only the other day and it started fine then. There are no wires that have shorted on the glow plugs or anything. I have an idea it could be a relay or something.(the fuse is OK)

Please help...im stumped and lost without my car!!!!!