I recommend you look at the rules around lighting, especially in built up (ie 30mph) areas.
I knew that already but for the record, the (relevant) rules for lighting in built up (i.e. 30mph) areas from the Highway Code are:
Rule 113
You MUST
ensure all sidelights and rear registration plate lights are lit between sunset and sunrise
use headlights at night, except on a road which has lit street lighting. These roads are generally restricted to a speed limit of 30 mph (48 km/h) unless otherwise specified
use headlights when visibility is seriously reduced (see Rule 226).
Rule 115
You should also
use dipped headlights, or dim-dip if fitted, at night in built-up areas and in dull daytime weather, to ensure that you can be seen
Rule 226
You MUST use headlights when visibility is seriously reduced, generally when you cannot see for more than 100 metres (328 feet). You may also use front or rear fog lights but you MUST switch them off when visibility improves (see Rule 236).
My original point was that some numpties drive on unlit unrestricted roads including motorways with just parking lights on. Many is the time where I've looked in a door mirror and seen a gap between cars approaching in the lane to my right, only at the last minute to have to abort because I've just about seen a pair (or only one sometimes) of parking lights, no brighter than the random relections of car bodies. It's probably the case that they forgot to turn them on after driving around town like that (saving the battery), but that just shows a lack of due care and attention.
There is nothing in the HC that says that you
can't drive under dipped headlights in a 30mph area, but you are encouraged to put extra lights on if you need them.
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TTS and S3 here , my other lighting pet hate is headlamps out . Nearly all modern cars will have warnings but every other car seems to have a bulb out
TTS & S3. What are they, rules in the Highway Code?