Skull wrote:
I am sure Stevie, had no intention of killing the Ph driver, either at the garage or upon his arrival at Saughton Park. And I don't think that anyone could claim, he set out to use his taxi as a weapon.
The only premeditated act, I can see, lies with the Ph driver preparing himself with a knife.

I might also add that, if Stevie sticks to his story of running over his knife wielding attacker accidentally, while attempting to make his escape, and the prosecution can't prove otherwise, there's no means rea. Stevie was simply acting out of fear for his own life.
I think the question would be, what would you do faced with the same circumstances?
Cu nn ing ham, R v (1981) HL'Must know' content indicated by red triangle
[Murder - intention – intention to commit homicide or grievous bodily harm]
D attacked V in a pub, hitting him repeatedly with a chair, which resulted in V’s death.
Held: Intention to cause grievous bodily harm, but not to cause death, is sufficient to establish the mens rea for murder.
Lord Hailsham LC:
‘malice aforethought has never been limited to the intention to kill or to endanger life’.
Lord Edmund-Davies (dissenting):
"I find it passing strange that a person can be convicted of murder if death results from, say, his intentional breaking of another’s arm, an action which, while undoubtedly involving the infliction of ‘really serious harm’ and, as such, calling for severe punishment, would in most cases be unlikely to kill. And yet, for the lesser offence of attempted murder, nothing less than an intent to kill will suffice. But -
I recognise the force of the contrary view that the outcome of intentionally inflicting serious harm can be so unpredictable that anyone prepared to act so wickedly has little ground for complaint if, where death results, he is convicted and punished as severely as one who intended to kill."The verdict above was Guilty
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Does anyone doubt that setting out to have a square go involves a level of violence, and that violence could lead to harm coming to another, that any consequential harm, whatever the intensity, could have been foreseen and that the ultimate consequence could have been foreseen?
Interestingly, Tomy Martine - the guy whop shot and killed the burglar - was originally found guilty of murder. This was reduce to manslaughter on appeal.
The key has to be the circumstances of how the victim came into contact with the taxi, and whether it was a single contact or otherwise.
With the option of another course of action that could have avoided the death of the victim, I would suggest that the alleged existence of any weapon may prove irrelevant.
While perhaps understandable that one could act desperately and unreasonably in gthe face of even a life threatening attack, minimum force is all that is allowed in Law. One is not allowed to destroy an attacker unless that is the minimum force required to preserve your own life. Hard to prove.
I suspect that the actions of any victim will have little effect on the finding of guilt or otherwise. Although it could be offered in mitigation at sentencing.