The V5c will show the SMB number as the chassis number, this was common at one time and lawful.
When we first began to build the Renault Kangoo, we used to issue an SMB conversion number which was unique to each vehicle. We would either use the SMB or the chassis number to register the vehicle.
The VIN no is located on the front right door jamb below the door catch. Depending on the year of the manufacturer, it will show on the front near side/left of the windscreen.
The stamped chassis number is stamped into the floor panel cross member located under the front of the right-hand front sear under a flap of carpet.
