you need 4 things to start a diesel engine,air,compression,fuel and heat.
more than likely you have a fuel problem considering it was ok when you last drove it and that was apretty good model.
get a 17ml open end spanner and loosen the pipe on the top of the engine going to any injector.
get someone to crank the engine over for 5 to 15 second if no fuel comes up that will be your problem.
put at least ten lts of diesel in the tank in case your fuel has been stolen while it was parked.
not much to the fuel system on that model other than the injector pump and they usually bleed up quickley.
if you do have fuel let me know and i will give u a few other checks to do.
i do have some other suggestions but lets cover the basics first
mark, July 2011