Lane discipline in this country is shocking (havent driven abroad in recent years), whenever i go near a motorway it infuriates me beyond belief.
Even dual carriage ways are poor, people sitting in the right hand land because at the next roundabout miles up the road they want to turn right.
I agree this is annoying but the trouble is no one lets you in when you want to move over as you near the roundabout. I tend to think if they are doing the speed limit then dont worry just sit back and enjoy the drive