Boss....

It will be the glow plug relay, iirc it is situated under the battery tray, you really don't want to be replacing it at about £80 + vat

If you cant find it easily, just trace the big red wire that goes to the glow plugs!

Other than that there are loads of other shit little things to try!!!!!

Are you at home 2nite? I might pop round on my way home from work!