Perth VDJ200 with Exploroz sticker

not quite correct there Tim.
Black smoke generally from lack of oxygen causing incomplete combustion i.e blocked air filter, dodgy turbo or possibly injectors, maybe low compression etc

White smoke generally incomplete combustion from too low combustion temps-classic cause is a stuck or removed thermostat

B.....rima Diesel
http://www.berrimadiesel.com/home/diagnosing-diesel-smoke/

"Why do diesels smoke then? Well, for various reasons. Firstly, black smoke is generally from over-fuelling of some sort and usually that means the fuel adjustment of the injector pump is set too high. Other causes can be low injector pressures coupled with poor fuel atomisation. The low fuel pressure means that the injector is letting in more fuel and low pressure, usually making for a poor spray/atomisation. In the end, black smoke means that the combustion process has had too much fuel for the air available. Other colours of smoke, such as white or blue, are more connected with engine condition or more major injection system issues. Think of white smoke as ‘steam’. If diesel fuel is put in too late due to very retarded timing or if compression is low, some fuel particles will only be warmed up and so you will get white smoke from that.

...a smoking diesel is abnormal and should be attended to by a specialist can address the various causes of it."

Umm did you read what you cut and pasted?

"the end, black smoke means that the combustion process has had too much fuel for the air available"

"Think of white smoke as ‘steam’. If diesel fuel is put in too late due to very retarded timing or if compression is low, some fuel particles will only be warmed up and so you will get white smoke from that."

Yes I did. I thought it would be helpful. Just like you were trying to be helpful alerting the owner of the 200.

Too much fuel for the air available is different from poorly heated and partially burnt fuel.

Whatever..... smoke as you described is abnormal and yes the owner needs to resolve it.

You're assuming the copper sees him! I despair sometimes - drivers with NFI and not a copper in cooee! Maybe I'm only ever about at coffee break time?