My take is this, there appear to be two different types of driver, ones that are considerate of road users and those that aren't.
I've found in my conversations that those that drive for a living seem to be more considerate of others when they are on holiday so to speak. Of course I don't speak to everybody.
What I mean though is that those that have jobs like Taxi driver, (not the London variety), truck driver, moblie engineer seem to do things like keep to the left on very wide single carriageway roads to allow others to pass easily. They also seem to be the ones that cross quickly at the zebras - I mean if I've just parked my vehicle an are approaching a pedestrian crossing I try to cross along with others to keep traffic flowing, too often today you get to a crossing and people on foot just cross and keep the traffic stopped for ages.
Something else I do, (that I should probably not advocate for), is if the road is visibly clear for a long distance I don't press the button. I just walk across the road.
That said, we don't know what road you're on, the time of day, what vehicle, the traffic conditions etc etc, but it would seem reasonable to do 50 on a winding lane. I go out for a drive sometimes, just to drive and if I'm in cruise mode, I pull over when I can, (not too often), to let speeders past. If the road is really unsuitable though and in poor condition, (a lot of country roads are missing kerbs and have crumbling edges and have potholes and high hedges), I position my vehicle so as to discourage overtaking and the second it improves, I keep very much to the left, slow down and indicate left. With modern vehicles and smart phones you can see in advance where the straights are.