Good question, well presented.
I suppose its made me think a lot more about driving, both my own and other peoples and change the way I view the whole process. Ultimately, its made me get off my arse and pursue the IAM test (pre-test next Monday)
Whilst on my observed runs I had two experiences which amused my observer and which, previously, I might have reacted differently to or even done myself
We were approaching a roundabout near Shrewsbury and were overtaken by a fast moving German Saloon (ahem

) which proceeded to brake heavily as it adopted the right hand lane at the roundabout. This unplanned lunge compromised the cars momentum and it was forced to pull up and wait for another car on the roundabout; one which it would have emerged ahead of had the driver approached more thoughtfully.
As it was, we sailed imperiously by in the left hand lane, slotting in behind the car on the roundabout and emerged at our exit with the german car behind us - he'd been in completely the wrong lane and position.
Similarly, whilst out today I slotted onto a roundabout safely ahead of a small red hatchback already on the island, a fact confirmed by my observer. Nonetheless, the hatchback driver gave me an irritated toot; it perhaps looked to him as though I'd just emerged without considering him. Fact is, he'd have needed to have been driving a Mclaren F1 car to both corner and accelerate at a rate necessary for my emerge to have compromised him. A typical anal small car driver was the comment from my observer
