I shall start arguing about this stuff again! Maybe if more of us do it, people might actually take some notice.
I tried in the petrol station saying that I didn't appreciate the "top shelf" mags now being at child-height in front of the till a few years back, but got such a brain-dead expression from the girl behind the till that I just stopped going there. But didn't bother writing to the manager. Next time, I'll try to take more effective action!