Had a run-in today with the same vehicle: on the stretch of road on A600 between A421 and Shortstown. Started with a dramatic lane change on one roundabout (no signal), approached next one in wrong lane, cut right across roundabout exiting left hand lane (no signal and sudden lane change) and therefore near side on collision, rude hand-gesture on being tooted, tailgating vehicle in front and finally speeding (40+mph in 30 mph zone). Seems unnecessarily impatient and aggressive in an area close to a driver test centre - patience with learner drivers is needed!.
White Astra, LC66 WEH. attempted to overtake 4 cars at once on a blind corner on Lower Sunbury road.