There are people on here saying the reason for DRL legislation is related to pedestrian safety, and that is why only the fronts are mandated. I do not believe this to be the case, do you have any corroboration of these statements ?
The Government website, states "Daytime running lights (DRL) are purpose-made, low-wattage lights that can be fitted to a vehicle and used during the day
to improve the visibility of a vehicle to other drivers as well as pedestrians, cyclists and other road users." it goes on to say
"Research has shown that DRLs are likely to reduce
multiple vehicle daytime accidents and fatalities by up to 6% once all vehicles are equipped. "
www.gov.uk
Volvo has had the lights permanently lit on their cars, front and back for probably 40 years, because having lights on during the day reduces the number of accidents.
You can make all the arguments you want, that people should be responsible for their driving and paying appropriate attention, and turning on their lights when appropriate etc. But the simple fact remains that research shows, that lights on, on cars during the day, helps the visibility of cars and reduces accidents, and I can't think of a reason why you wouldn't want them on, so I've no idea why the legislation is as it is.
Why would you not want to reduce the risk of someone running in to the back of you ?