2004 freelander td4

Hi, my freelander td4 116k miles, smokes like crazy on start up from cold i.e. standing over night. The revs are lumpy until the engine clears the smoke. Once the engine is at temperature it is ok on start up. The engine starts well, pulls well, does not over heat, coolant levels ok, drives well. Just cold start!
The mechanic who put injectors in last year said something about the fuel rail, would that be the sensor or valve on the rail?
It really is smoke city in the morning. It is if there is fuel getting in and trying to flood it, good job it starts bob-on.
Can any one help me out, do i buy a fuel rail? sensor? valve?
I am not spending a fortune as it runs great when at temperature, Oh i slightly over filled it with oil when i changed it (only a mm or so above max)

Would a faulty fuel rail pressure switch cause it?

have you cleaned this?is there smoke from the dipstick ROVER 75 MG ZT ZTT CDT CDTI NEW CRANKCASE OIL BREATHER FILTER KIT, HOUSING VALVE | eBay

Hi, just went to replace filter today and there was not a filter in it! why is this??? would a dodgy injector do it?