YABVU and a massive fool to think that you should drive at 60 on country roads. Country roads haven't all been deemed safe to drive at 60, it would just be a pita for them to make them all the appropriate speed limits so they make them all national. Why I don't know, as very few I've driven are safe to drive at sixty.
My commute is all country roads, I wouldn't drive any of them over 50/55 and that's because I know the roads, I know where the turns are, etc. If you don't know the road then going over 45 is mad, you hit a wrong corner at that speed and you're fucked.
Part of my commute is Ditchling Beacon. It's a national speed limit road so a 60 stretch, yet the entire thing is a loop de loop at a very steep angle. It is not appropriate to drive 60 on it (tbh, 30 is pushing it as it's all blind corners).
I don't like people who drive slowly for the sake of it, much like I don't like those who drive fast for the sake of it either. Speed limits are maximums, not targets, and you should always go at the speed appropriate to the road and it's conditions.
If you are running late, leave earlier.
I'll also say that last year my sister had an accident in which her car flipped and went through a fence on a 60 road bend. She was doing 45/50 which is what I would do on that same bend but her little car couldn't handle it and flipped. It was only in the past three months that the speed limit on that stretch changed to 40 because somebody died at the end of last year doing the same thing. I think that the police told my sister that a certain amount of accidents have to occur, of which a certain amount have to be fatalities, before the local authority start even looking into speed limit changes.