diesel blowing black stuff!

Gossy,
if you are confident that the vehicle is tuned, serviced and in reasonable condition, I would suggest it is probably a little condensation blowing out the exhaust mixed with a little carbon dust.

I wouldn't be to worried unless it starts to use water/fuel at a greater rate than normal.

I am guessing it is a small patch of black spray each morning.

Toytruck

Is it coming out of the exhaust??? It may be moisture condensation in the pipe- washing a bit of soot out???

Especially if you are only doing short trips abck and forth to the shops etc. Doesn't give the exhaust time to get hot enough to dry out so may make it look a lot more than it really is. If this is the case try and give it a bit longer runs because this is also what rusts exhausts out. Country cars generally don't rust the exhaust out anywhere near as quickly as city vehicles, they tend to drive further more often heating up the exhaust and drying it out.

If it really bothers you the best bet would be to have a "drip" tray or pan to catch it

this sounds exactly what it is like (seems logical after reading it!). The car doesn't do much work around town at all. It can sit in the drive for weeks without being driven (purely for camping etc). So it makes sense that there is moisture in the exhaust.
I am off to do the Simpson from Adelaide in two weeks. That should give it a good clean out!

Thanks, I can stop worrying.