how can i override the immobiliser on my Renault Megane 52 plate ?

I have a renault megane 1.6 coupe fidji, and i can't get any thing out of it, it was fine last night but this morning the key wouldn't operate the central locking system, then when i got the doors open i noticed the immobiliser light was flashing continuously, although the dash lit up the car wouldn't start, renault have said that i should take it in to them but money is tight right now, is there way to override the immobilser so that i can start the engine.