Disco 1 No fog lights

Got a couple of issues to sort on my 1998 3-door before the MOT. Apart from welding in the usual places, the rear fog lights don't work. (I'm a bit new to Discos so bear with me.) The tell-tale on the switch doesn't light up either. I've checked the fuses and they're all good, so where next? Is there a relay for the rear fog- if so where is it?

Not taking the psis but you do have the ign on and the lights on before switching the fog on?
The giveaway to me would be the no switch light.

Long time since I looked at a 300, but common for most circtuits to have two fuses, 1 to protect the fog light itself and another to protect the switched side of the circuit, the fuses are often shared with other circuits, so mayeb something else does not work?

Attached pdf of foglight wiring from Rave... sorry it appears to be empty, I hate win10