Anyone? Barely safe to drive right now lol. Headlights sometimes don't work
The 2006 LHD CRD has a known problem with the wire harness that goes behind the Fuel Filter Head Mounting Bracket can get damaged in that area causing random chaffing of wires to the chassis and causing all sorts of problems.
Remove the Mounting Bracket and have a good look at the wiring that goes behind it to check for any chaffing/damage.
If no problem here, check the battery connections, connection of negative battery lead to chassis, connection of Grounding Strap from engine to chassis are all clean and tight.
I think it is best to post problems like this in the CRD section......most people only come here for problems like Sound System Upgrade problems.