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If the fog lights only turn on when the headlights are on, is that enough to pass the IVA test? I have heard that the fog switch now needs to reset back to off when the ignition is turned off so that it cannot accidently be left on for next time you use the vehicle and turn the main lights on. I tested this on my modern vehicle and sure enough if does reset. 

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I got through IVA (in 2017) without that but I don't recall him actively testing it either.

However, I'm pretty sure that when I read the IVA manual, it was not a requirement, from my understanding, so I was never thinking about it during the test.

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This is from the IVA manual -

Note 4: Either of the following scenarios will also be
considered acceptable:
􀁸 The rear fog lamp(s) may continue to operate until the
position lamps are switched off, and the rear fog
lamp(s) must then remain off until deliberately
switched on again or,
􀁸 An audible warning, additional to the mandatory telltale
light, must be activated if the ignition is switched
off or the ignition key is withdrawn and the driver's
door is opened, whether the lamps in (RS4) are on or
off, whilst the rear fog lamp switch is in the "on"
position.

I've fitted one of these -  REAR FOG LIGHT CONTROLLER for new IVA rules | Car Builder - Kit & Classic Car Parts Specialist

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1 hour ago, rthomas69 said:

This is from the IVA manual -

Note 4: Either of the following scenarios will also be
considered acceptable:

􀁸 The rear fog lamp(s) may continue to operate until the
position lamps are switched off, and the rear fog
lamp(s) must then remain off until deliberately
switched on again or,
􀁸 An audible warning, additional to the mandatory telltale
light, must be activated if the ignition is switched
off or the ignition key is withdrawn and the driver's
door is opened, whether the lamps in (RS4) are on or
off, whilst the rear fog lamp switch is in the "on"
position.

I've fitted one of these -  REAR FOG LIGHT CONTROLLER for new IVA rules | Car Builder - Kit & Classic Car Parts Specialist

Note the text in red....this is an alternative option, NOT a requirement IMO. The actual requirement only says this:

4. The rear fog lamp(s) must only illuminate when dipped beam, main beam or front fog lamps are lit (see alternatives in Notes 3 & 4)

 

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I did a iva in Sept 22 and the tester checked that they stayed off after ignition is switched back on an fogs only come on after reset car builder solutions do a relay to facilitate this for about 30 quid

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