Ok, after much reading, testing, evaluation and mucking around I've made some discoveries.
The speed camera alerts are uni-directional - that is, they only alert based on the direction you are travelling.
(Even the TomTom help desk lady couldn't explain this too me!)
I suspect this is due to the fact that in many countries, the cameras only deal with one side of the road - traffic travelling in one direction.
Here in NZ, our cameras (both fixed and mobile) will monitor BOTH directions.
When you 'add' a camera notification, it does not automatically update the file in the GPS.
It waits until you connect to TomTom Home, then sends the co-ordinates back to TomTom.
Then, when you download a new, updated camera alert file, it will be in that.
I hope this might be of use to others.
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