I knew someone would.
Symptoms. Interior lights, glovebox light, boot light and puddle lights all out. Can't be all 4 bulbs so must be blown fuse obviously. Been through the fusebox systematically and all ok so while at HRG mentioned this to Alfie who kindly said he would take a look. He went systematically through the fusebox but couldn't find the fault. We decided to leave it until the rear suspension is being done. Drove home and noticed the windows didn't now work, nor did the central locking or fuel and boot solenoids. Fortunately Alfie wasn't too busy this pm so drove her back. 2 hours later after Alfie and two of his lads had all scratched their heads and I had jet washed one of their vans we found that Alfie had accidentally disconnected a wire at the back of the fuse box. Doh!
The interior lights are fixed as well. Not a fuse. Someone had deliberately disconnected the bulb in the boot to save drain on the battery. The loose cable was earthing the other lights on the same ring.