Didn't the original poster mean that he had fitted white lights, sold as front fog lights, but for use to supplement the reversing light?
I got that impression, and that they were optional (switched) too.
I've never seen an examiner test that the hazards worked at the same time as the main reverse lights (although it'd be nice if they did check that) and certainly never seen one test my switched rear loading lamp.
However, don't testers still have the right to fail a vehicle for ANY reason, if they consider it unroadworthy, even though it's passed all the specific tests?
:) K