TomTom ONE and Speed Cameras

I do not have a GRPS Phone at present. Are speed camera locations only available via Tom Tom Plus? Or are speed cameras pre-loaded as points of interest with the TomTom One? Or is there a download option? Updateable??

Also is there any advantage of city maps from TomTom PLus over the pre-loaded street to street GB mapping? Or is this for wandering around 'Paris' TomTom ONE in hand? - how romantic!

Finally how useful/accurate/timely do people find TomTom Plus traffic option? (Especially interested in anyone travelling around West London)

Oh and finally can anyone tell me how many favourite places can be saved on TomTom ONE?

Thanks for your help

The TomTom speed cameras are not considered very good, better to use the gpsworld one which is presently free.