Originally Posted by Alastair

Worth Confirming the Glow-plugs are actually ALL working, not unusual for one to read right with meter, but still not work well enough. (Best way, is drop out Injectors and actually look at 'em with Ign on. Should be a nice bright orange)

IP Timing will have a big affect on the starting and stone-cold smoke levels, so worth confirming its correct--Bit of a fiddle, but costs little to do...

You have new injectors so we should be able to rule those out.

Starting when hot, after say 10 mins standing, How's the smoke then? Any blue/whitish puffs?
--If left to idle for a few mins, then revved, Any smoke?-Colour? If so, Tends to indicate valve-guides and seals....