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It might be that the car battery itself is flat. When the car battery goes flat the immobiliser clears itself. When you try to start the car it won't work.
Test this theory by turning on the lights. If the lights are dim then the battery's flat. If this is the problem you first need to recharge the battery. When this is done have an auto electrician (you can find one in the yellow pages) come and reset your immobiliser.
When this happened to me in a previous car I had the RAC come out to give the battery a boost and then the auto electrician out to reset the immobiliser. Don't get the electrician out first because if the battery is flat the immobiliser will clear again and you'll have to get the electrician back out again, at extra cost.
Try to make sure the battery is flat before going through this because the elctrician will charge you about £40. Hope this helps.
Currently in ijdonaldson's garage:
2003 Laguna II 1.9 DCi