Just to let anyone who is having an issue with their speed camera alerts, my car went back to the dealer yesterday, they did both map and software updates which only came out this week apparently and that has now fixed the problem. The garage did not believe me that they were not working as they had the the beginning, telling me they were so I had to prove to them by driving normally at a local speed camera that they were not working, they tried to fob me off with saying it was the volume turned down, you have to have a route turned on and they only work when driving above the limit as you approach the camera. Now they are working when driving at any speed towards a camera and without a route being set - and the camera icon is back on the map which had disappeared too. They also told me at some point during the morning that they cannot do a USB update on the NX, well they did it. Shame it takes so much convincing to get things back on track when this apparently has been known at Lexus for some months.