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I've wired a fog light into one of the reverse lights because i didn't want to stick one on the bumper.
A friend of mine is an MOT tester and he said thats fine.
it needs one for an SVA and most dealers will just wire up an auxiliary one, but if you ask they might put it on a bracket rather than the bumper, then you can remove it after your MOT.....or do the rear lamp conversion
I did exactly as two others above - put a red superbright LED one into the offside reversing light position. I run it off a UK rear foglight switch which is placed right next to the front fog switch to the right of the steering wheel and it looks totally factory. Plus it actually works REALLY well and easily passes MOT.