2005 td4 won't start.

Hi guys/gals, I'm new to the forum been looking for some help/advice! Bought a freelander td4 (2005) two months ago and had nothing but trouble from the day! Initially cut out several times, blowing grey smoke and lack of power, them last week cut out and would not start! Ended up calling the AA today only to find out it was dodgy wiring on the fuel pressure regulator! Recently pit new injector (no4), starter motor, crankshaft sensor and few other bits too.