I wonder can someone help me.

I 've just spent £1k on my 2004 signum to get it throw the MOT and now this light has started flashing on the dash and I am having nightmares about having to spend more of my hard earned cash.

She is the design 1.9cdti and this light for the glow plugs starting flashing about a week ago.

The car running fine and starts dead on but this light constantly flashes at me as soon as turn on the ignition.

Anyone any ideas!!!