Cigar power socket?

I have a 57 plate Focus estate. The rear aux power supply works but the cigar socket in the front does not. There is no power to it at all. I understand that they are both fed from the same fuse so I assume as the back one works the fuse must be OK.
I have look at the wiring on the back of the cigar socket as far as I can without finding a fault.

Help please.