Sorry for the slow reply but thanks for asking. I've lost one headlight and indicator, both tail lights and the interior lighting around the heater controls etc. Fuses and bulbs appear OK so I'm guessing at some sort of module or other..
If anyone has a similar problem, this turned out to be a failed electrical distribution box. The item is behind the battery, holds a series of relays and fuses and has an ECU type item plugged into it. Jeep quoted a four week lead on the part however a second hand unit was sourced overnight and proved to be a ten minute fit.
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come