Hi John,
At the time of asking for the various 'extras', to be included in the purchase price, your dealer might have asked if you required them [reversing censors], if so, they would have told you that a 'City Pack' would be required at a cost of £200. This gives you an icon on the dash screen when you select reverse, showing an outline of the car with coloured dash lines around the rear to indicate closeness to objects, and also it lowers the sound emitted from the radio, or other music device you have switched on in the car at the time
.
If you didn't request, or ask for something like that at the time of choosing, then the chances are very slim for having the reversing censors working, irrespective of the cars level i.e. Studio, Zetec, Ecoboost. If you look online in the Sales brochure, I think all the lists are there for all the options you might like in, or fitted to the car
. Hope this is of some help to you.