My engine seems very reluctant to start on these cold mornings, and I've done a little digging:
Leaving the door open slightly so the interior lights come on, engage the ignition and the glow plug light comes on. Up until I hear the relay 'click' for the GPs, there is no change in the brightness of the interior lights, neither is there any movement on the dash battery gauge.
Could this simply be a result of a blown fuse? Or are there any more likely places for a broken circuit?