On 26/03/2021 16:09, Harry Bloomfield wrote:
jim GM4DHJ ... used his keyboard to write :
On 26/03/2021 13:11, jim GM4DHJ ... wrote:
do fog lights and especially rear fog lights require a warning light
that they are on ?

...and is it an MOT failure if you don't have one ? ...

Yes and yes.
Reversing light switch has to either be mechanically linked to the
reverse gear or there has to be a warning light.

Bill