Who was driving the car that hit Sam Tyler?

That is a very good point! I thought that as well, wondered if it was significant, because when you see him get out of his car, you can see the car that hit him come round the corner of the street, I wondered "How the hell did he not see him?" So I assumed that somebody had done it deliberately.

I figured it might have been that guy that Sam could hear in his "head", the one that tried to kill him while he was in a coma, but nope...also it occured to me that the car stopped right after it hit Sam, if it was somebody who wanted him dead, they would of just driven off, hit 'n' run, surely?

Hmm, maybe it was just one of those things? Sadly we'll never know, unless they have the answer in Ashes to Ashes, but I highly doubt that.

A pissed-up retired Gene Hunt, who sees Sam and thinks *beep* me I thought he was dead!" shakes his head, swerves in the process and knocks over Sam. QED

He was actually not hit by a car. It's explained at the end when they discover the reason he is in the coma: the brain tumor. He *thinks* he was hit by a car, when in reality, he was knocked unconscious by his tumor.

Toonces, the driving cat.