V8V - no power from the 12v socket in the cabin

[Frances The Mute]

Morning all

I noticed on the weekend that the 12v socket is dead. It illuminates when the lights are on (suggesting power is getting to it) but it fails to charge my phone etc.

I've taken a look at the list of fuses but I can only see a fuse (45) for the illumination. Is the power on another fuse? Does anyone know what number it is? The owners manual is a little vague in its description.

[Frances The Mute]

Many thanks, gents!