While your advice to use both feet may be perfectly sensible for many drivers, for someone like me, 70 years old, an owner and driver of cars - mostly manuals - for 52 of those years and therefore pretty much set in my ways, your advice is contentious to say the least. I could no more left-foot brake than fly in the air. When manoeuvring in a car park I use accelerator and handbrake, on the open road my right foot accelerates and brakes, making it impossible to do both at the same time. A handy safety feature, I would have thought.