Its started having difficulty starting.

Let the glow plugs warm up then go to turn it over and nothing happens, no noise from the starter or any attempt to start the engine at all.

So i bought a new starter and fitted this...waste of time, it still won't start.

Thing is, it'll bump start fine, then run for a couple of days then start misbehaving again.

Basically I don't have a clue where to start LOL.

Any pointers or help would be greatly appreciated