Appreciate everyone's input.
Martyn, thanks for your useful information. That might be the way to go. I've given the blower a go on the focusing screen and mirror but the problem still exists.
I've just ordered some Eclipse Cleaning Fluid and Swabs for the sensor so I'm sure that will cure...
I have a Nikon D200 that I've used for quite some time now and almost overnight I seem to have been invaded by dust/marks.
I think this problem is two-fold : the sensor needs cleaning as these marks have just started to show up on photos (at small f/stops f/22).
My main concern though...
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