On Thu, 15 Oct 2020 10:40:59 +0100, NY wrote:

Given that tail and fog lights serve the same purpose, of defining the
presence and width of the vehicle as seen from behind,

They might now but at one time a single fog light was allowed. The
rear light clusters having that single fog on the (off?) side and the
reversing light in the same position on the (near?) side.

--
Cheers
Dave.