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G'day Simon,
Looking at the spots closer - I still suspect an insect. It must have been a very active one - I usually only get 4 or 5 spots.
(I still think if it's dust on the sensor you should be able to see it.)
Attached is your image - spots removed. (It could be done better but I hope you like it).
By the way if you want to get a better image of M42 - you need to take subs of shorter length also (maybe 10 -20 seconds) to avoid saturating the core. You then use layers and masks in photoshop to join the images of different exposures. Some people take subs of 4 different lengths to even out the difference in brightness. There are tutorials on youtube that explain how to do it.
Regards,
Tony.
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