Fairford rear camera and gas monitor problem

Both the camera monitor and gas tank indicator  leds are not working. No voltage shown on multimeter when they should be operating ( in reverse/engine running). Checked fuses under belted rear seats and below the drivers side dash, which seem fine. Any ideas? Many thanks. John

I think I have read the supply is taken somewhere under the drivers side step. Where you put your foot to climb into the drivers seat.

Are there fuses I might have missed? Should probably check they are seated well, next.

Extra fuses on top on the power unit.  A fuse marked FRIDGE D+ which I hadn't thought to check had blown. Problem fixed! Thanks for your help and encouragement.