I nearly had an accident today on SZR just by Defence Roundabout.
Not my fault but another example of aggressive stupid driving by others who believe that undertaking and jumping back into the fast lane within a whisker's breadth of the car behind is a really sensible idea.
I was in the fast lane, BMW X5 way behind me for some time, then pulled into the next lane beside me, attempted to get back into the fast lane in front of me but misjudged, no gap between me, and the 4x4 that was in front of him, and he smashed right into the 4x4. I swerved to avoid the accident and nearly scraped the side of my car down the red and white temporary concrete barriers.
If he'd smashed my car I've have been tempted to smash his face.