The circuits looked ok once they were cleaned up, and yes, the rear wiring loom is homemade Alan R!! The tail light design on the EFIs seems to encourage water buildup IN the light unit, soaking the rear indicators and tail light connections. I remade the loom from the main look to the connectors earlier this year, but didn't need to do anything with the wiring on the consumers (learning!) themselves as they seemed sound at the time. Now, the last gremlin before MOT hopefully... how much should the headlamp glow brigther or dimmer based on engine revs? It still fluctuates, getting brighter at high revs, but much less noticably now that the earthing issue has improved. Lights still fluctuate in intensity a little when other consumables are flashing

but again, how much is acceptable? Interestingly, it is barely noticable when full beam is on.