Thanks useful information: 
I have been looking at some of my photos that show stuff that has landed on the sensor
and contrary to what material I have read about sensor dust on the internet; a) sensor dust
doesn't just appear as 'dust bunnies' (soft out of focus specs) and b) it can move around
from shot to shot.
The photos below have been taken at f8 and with different lenses, and shots
and in each shot the specs appear in differnet areas. Then in many other
shots of sky detail etc there is nothing, wheather shooting at a high or low f stop. So
it seems that sensor dust can move around and can appear as hard defined specs,
not just soft out of focus ones and always in the same spot as posts and articles about
the issue suggest. Unless of course a UFO has landed in this neck of the woods! lol
Here are some samples:
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