I have not been in the same situation because, in the event of a stationary car on a multi-lane road, drivers simply don't just swerve into another lane. If they do swerve, they will be braking first. Another thing that I have not come across on the road is a lifesize cardboard model of a car (that is virtually invisible to radar).
It seems Thatcham had point they wanted to make and setup a scenario in which to prove it. It would be interesting to know if Thatcham performed other tests, that were not shown, because they didn't fit Thatcham's agenda.