No Reversing Lights

[molliemo]

Hi I have just tried to have sensors fitted but the guy noticed that my reversing lights weren't working, the bulb seems fine and there are no missing fuses and the ones in have been checked and are fine. I have only had the vehicle for a couple of weeks so really don't know if they were working when I got it. Can some one please tell me which fuse is for the reversing lights so I can change it and check there is one there please. Its a c3 xtr (54)54 sensodrive many thanks in advance