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Latest update:
My mate Chris is making sure that whatever we do will pass an MOT (good thinking). Consequently, as currently on the workbench when having twin rear foglights, they override the extra LED indicators on the inner (bootlid mounted) units only. But we want all four indicator lights to action even if the two rear fogs are on. So he's having to create some microchip circuitry - Not a problem for him but just a delay.
We're confident we're going to get there but this first one is throwing up what needs solving - Guinea Pigging.
Btw, he tells me that apparently in Canada it is not allowed to alter oem lights in any way whatsoever. Australia has restrictions on aftermarket wheels, so perhaps we're better off than we realise in the UK... About some things.
He's also been telling me about new laser trap speed 'cams' in mainland Europe but he has found a (currently) legal workaround.