I have a 2014 (64 plate) Jazz 1.4 ES+ I-Vtec CVT  GG6 according to the V5 and have not been able to verify if it is CanBus  fitted or not.

 WWW sites give conflicting information!

I would like  to fit reversing sensors ( I know its only a small car!) 

It will more than likely have a certain amount of CanBus within the wiring system for a vehicle of that age.
The easiest way to identify if it is CanBus wiring you are tapping into is it will more than likely be 'twisted pair' wires and as long as it doesn't have any yellow covering over the wires which is usually SRS and should not be interfered with in any way
Usually, with CanBus wired ancillaries, they will need programming into the vehicle for identification into the system

Thanks Trevor I'll have a hunt round the rear lighting clusters.