Fog, Reverse & Number Plate Lights Won't Work

[2052006 10]

I have tried the obvious, bulbs, fuses, their respective switches etc, but am at a loss why none of these will work. As far as I can make out, all these lamps are fed by wiring from the left hand side of the car, going past (through?) the rear left light cluster.

 

Short of there being something wrong with the wiring from this point onwards, is there something I'm missing. I feel there must be something simple I'm missing, as all three won't work!

 

MOT's booked for Monday and this is causing me a headache!

[welshpug 1,621]

Check the earth, phase 1 & 1.5 have a separate single spade iirc.

 

reverse is not part of mot test btw.

[2052006 10]

Mine is a phase 2. Where is the earth? Is it the block in the left rear wing?