I was referencing one perticular section of road, one way, two lanes, I stay left, all the way till it becomes two way road again, and people always keep throwing their cars left at the last minute from the right hand lane, it's not really an "undertake", as I stay in my own lane the whole time, but I can't really describe it any other way.
Essentially it for fills all the requirements in the highway code for passing vehicles on the left hand side legally.
At speed, I meant the speed limit, 30mph, as opposed to 5mph. Although that's not because I don't drive fast on the road, I drive at a speed I choose, but it's no fun going fast in a straight line.
I don't mind what people do on the road, careless driving or not, just so long as no other vehicle or pedestrian has to change speed or direction.