Drink Driving death: appropriate sentence ??

He was doing 60 in a 40 - so instead of covering 18 metres each second, he was covering 27 - when a car pulled out into his path. The driver died in hospital from a bleed on the brain, exacerbated by pre-existing medical conditions.

How far away do we think a Range Rover should be visible to somebody, given the absolute minimum eyesight standard for driving requires number plates to be read from 20m?
This is the junction in question...
maps.app.goo.gl/DpuVhvx3r4LRz6cE6

No, carelessly. He was found not guilty by a jury of driving dangerously.
...following another police car - both with lights and sirens going. The pedestrian was just starting to cross the road at 11pm when she was passed by the first police car, and continued to cross when she was hit by the second, three to four seconds later. The police driver braked for two seconds as he saw her crossing before the impact.

Video of the first car passing her...
londonnewsonline.co.uk/met-officer-jailed-for-killing-mum-in-police-car-crash-after-driving-at-motorway-speeds-in-brixton/

But why not? I mean if it goes up to 10 years or 15 are we not approaching the sentence for murder itself?

I suppose what I don't understand is if we go up to say 10 years, then the only difference between drink driving, for which the penalty is often a 1 year driving ban and causing death by dangerous driving is the matter of the an accident. In both cases, the defender has acted in the same way.

Hence why 6 years which is quite a lengthy sentence is about right I think. I appreciate I'm the only one here to think that - I'm used to that these days.

According to police.uk

Return of the death sentence would thin them out a bit. Also excellent deterrent

It's inherent in the justice system that the harm caused matters, as well as intent and method. I would say this is pretty near universal, at least in the developed world. 

Sentencing is a malleable thing. Sentencing guidelines generally provide for a wide range, and take into account things like the level of culpability and the degree of harm caused (the same chargeable offence cover a multitude of sins, otherwise we'd have a zillion trillion different offences), and can even include the level of remorse etc. 

Consequently there is frequently considerable overlap between sentencing available for different chargeable offences. For example, the top end of ABH has a category of 18 months to 4 years custody. [Leaving aside the availability the special cases of 5 and 7 years max available]. The low end of GBH - the more serious offence - is 2-4 years. 

Manslaughter has a category range of 1-19 years  [and like GBH I believe can under quite specific circumstances lead to life sentence]. For murder, a life sentence is required to be passed (I understand). But the minimum term that must be specified is 15 years. 

Um I do wonder if those comparative homicide rates are more about the availability of weapons than the existence or non existence of the death sentence. Here couples hit each other or on occasion stab which the injured party will probably will survive, a 45 calibre weapon at short range however, fatal .